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A serial killer is typically a person who murders three or more persons,A * * * * with the murders taking place over more than a month and including a significant period of time between them. While most authorities set a threshold of three murders, others extend it to four or lessen it to two. Psychological gratification is the usual motive for serial killing, and many serial murders involve sexual contact with the victim. The
Federal Bureau of Investigation The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States and its principal federal law enforcement agency. Operating under the jurisdiction of the United States Department of Justice, t ...
(FBI) states that the motives of serial killers can include anger, thrill-seeking, financial gain, and
attention seeking Attention seeking behavior is to act in a way that is likely to elicit attention. Attention seeking behavior is defined in the DSM-5 as "engaging in behavior designed to attract notice and to make oneself the focus of others’ attention and admir ...
, and killings may be executed as such. The victims may have something in common; for example,
demographic profile Demographic profiling is a form of demographic analysis used by marketers so that they may be as efficient as possible with advertising products or services and identifying any possible gaps in their marketing strategy. Demographic profiling can ...
, appearance, gender or race. Often the FBI will focus on a particular pattern serial killers follow. Based on this pattern, this will give key clues into finding the killer along with their motives. Although a serial killer is a distinct classification that differs from that of a
mass murder Mass murder is the act of murdering a number of people, typically simultaneously or over a relatively short period of time and in close geographic proximity. The United States Congress defines mass killings as the killings of three or more pe ...
er,
spree killer A spree killer is someone who commits a criminal act that involves two or more murders or homicides in a short time, in multiple locations. The U.S. Bureau of Justice Statistics defines a spree killing as "killings at two or more locations wi ...
, or
contract killer Contract killing is a form of murder or assassination in which one party hires another party to kill a targeted person or persons. It involves an illegal agreement which includes some form of payment, monetary or otherwise. Either party may b ...
, there exist conceptual overlaps between them. Some debate exists on the specific criteria for each category, especially with regard to the distinction between spree killers and serial killers.* * * *


Etymology and definition

The English term and concept of ''serial killer'' are commonly attributed to former FBI Special agent Robert Ressler, who used the term ''serial homicide'' in 1974 in a lecture at Police Staff Academy in
Bramshill Bramshill is a civil parish in the English county of Hampshire. Its name has become synonymous with the Police Staff College, Bramshill located in Bramshill House. Bramshill forms part of the district of Hart. It is bordered by the Rivers ...
,
Hampshire Hampshire (, ; abbreviated to Hants) is a ceremonial county, ceremonial and non-metropolitan county, non-metropolitan counties of England, county in western South East England on the coast of the English Channel. Home to two major English citi ...
,
England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separa ...
,
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and No ...
. Author
Ann Rule Ann Rae Rule (''née'' Stackhouse; October 22, 1931 – July 26, 2015) was an American author of true crime books and articles. She is best known for '' The Stranger Beside Me'' (1980), about the serial killer Ted Bundy, with whom Rule worked a ...
postulates in her 2004 book ''Kiss Me, Kill Me'', that the English-language credit for coining the term goes to
LAPD The Los Angeles Police Department (LAPD), officially known as the City of Los Angeles Police Department, is the municipal police department of Los Angeles, California. With 9,974 police officers and 3,000 civilian staff, it is the third-larg ...
detective Pierce Brooks, who created the Violent Criminal Apprehension Program (ViCAP) system in 1985. The German term and concept were coined by criminologist Ernst Gennat, who described
Peter Kürten Peter Kürten (; 26 May 1883 – 2 July 1931) was a German serial killer, known as "The Vampire of Düsseldorf" and the "Düsseldorf Monster", who committed a series of murders and sexual assaults between February and November 1929 in the city o ...
as a ' ('serial-murderer') in his article "" (1930). In his book, '' Serial Killers: The Method and Madness of Monsters'' (2004), criminal justice historian
Peter Vronsky Peter Vronsky is a Canadian author, filmmaker and investigative historian. He holds a PhD in criminal justice history and espionage in international relations from the University of Toronto. He is the author of the bestseller true crime histor ...
notes that while Ressler might have coined the English term "serial homicide" within the law in 1974, the terms ''serial murder'' and ''serial murderer'' appear in John Brophy's book ''The Meaning of Murder'' (1966). The Washington, D.C., newspaper '' Evening Star'', in a 1967 review of the book: Vronsky states that the term ''serial killing'' first entered into broader American popular usage when published in ''
The New York Times ''The New York Times'' (''the Times'', ''NYT'', or the Gray Lady) is a daily newspaper based in New York City with a worldwide readership reported in 2020 to comprise a declining 840,000 paid print subscribers, and a growing 6 million paid ...
'' in the spring of 1981, to describe Atlanta serial killer
Wayne Williams Wayne Bertram Williams (born May 27, 1958) is an American convicted murderer and suspected serial killer who is serving life imprisonment for the 1981 killing of two men in Atlanta, Georgia. Although never tried, he is nonetheless believed to be ...
. Subsequently, throughout the 1980s, the term was used again in the pages of ''The New York Times'', one of the major national news publications of the United States, on 233 occasions. By the end of the 1990s, the use of the term had increased to 2,514 instances in the paper. When defining serial killers, researchers generally use "three or more murders" as the baseline, considering it sufficient to provide a pattern without being overly restrictive. Independent of the number of murders, they need to have been committed at different times, and are usually committed in different places. The lack of a cooling-off period (a significant break between the murders) marks the difference between a
spree killer A spree killer is someone who commits a criminal act that involves two or more murders or homicides in a short time, in multiple locations. The U.S. Bureau of Justice Statistics defines a spree killing as "killings at two or more locations wi ...
and a serial killer. The category has, however, been found to be of no real value to law enforcement, because of definitional problems relating to the concept of a "cooling-off period". Cases of extended bouts of sequential killings over periods of weeks or months with no apparent "cooling off period" or "return to normality" have caused some experts to suggest a hybrid category of "spree-serial killer". In ''Controversial Issues in Criminology'', Fuller and Hickey write that " e element of time involved between murderous acts is primary in the differentiation of serial, mass, and spree murderers", later elaborating that spree killers "will engage in the killing acts for days or weeks" while the "methods of murder and types of victims vary". Andrew Cunanan is given as an example of spree killing, while
Charles Whitman Charles Joseph Whitman (June 24, 1941 – August 1, 1966) was an American mass murderer who became known as the "Texas Tower Sniper". On August 1, 1966, Whitman used knives to kill his mother and his wife in their respective homes, then went to ...
is mentioned in connection with mass murder, and
Jeffrey Dahmer Jeffrey Lionel Dahmer (; May 21, 1960 – November 28, 1994), also known as the Milwaukee Cannibal or the Milwaukee Monster, was an American serial killer and sex offender who killed and dismemberment, dismembered seventeen men and boys ...
with serial killing. The
Federal Bureau of Investigation The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States and its principal federal law enforcement agency. Operating under the jurisdiction of the United States Department of Justice, t ...
(FBI) defines serial killing as "a series of two or more murders, committed as separate events, usually, but not always, by one offender acting alone". In 2005, the FBI hosted a multi-disciplinary symposium in San Antonio, Texas, which brought together 135 experts on serial murder from a variety of fields and specialties with the goal of identifying the commonalities of knowledge regarding serial murder. The group also settled on a definition of serial murder which FBI investigators widely accept as their standard: "The unlawful killing of two or more victims by the same offender(s) in separate events". The definition does not consider the motivation for killing nor define a cooling-off period.


History

Historical
criminologists Criminology (from Latin , "accusation", and Ancient Greek , ''-logia'', from λόγος ''logos'' meaning: "word, reason") is the study of crime and deviant behaviour. Criminology is an interdisciplinary field in both the behavioural and ...
suggest that there have been serial killers throughout history. Some sources suggest that legends such as
werewolves In folklore, a werewolf (), or occasionally lycanthrope (; ; uk, Вовкулака, Vovkulaka), is an individual that can shapeshift into a wolf (or, especially in modern film, a therianthropic hybrid wolf-like creature), either purposely o ...
and
vampire A vampire is a mythical creature that subsists by feeding on the Vitalism, vital essence (generally in the form of blood) of the living. In European folklore, vampires are undead, undead creatures that often visited loved ones and caused mi ...
s were inspired by
medieval In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire ...
serial killers. In Africa, there have been periodic outbreaks of murder by ''Lion'' and ''
Leopard men The Leopard Society (not to be confused with Ekpe), was a secret society that originated in Sierra Leone. Beatty, p.3 It was believed that members of the society could transform into leopards through the use of witchcraft. The earliest reference ...
''.
Liu Pengli Liu Pengli (), Prince of Jidong (), was a 2nd-century BC Han prince. Family Liu Pengli was the grandson of Emperor Wen (r. 180-157 BCE) and the nephew of Emperor Jing (r. 157-141 BCE). Liu Pengli was the third son of Liu Wu, Prince of Liang ...
of China, nephew of the
Han Han may refer to: Ethnic groups * Han Chinese, or Han People (): the name for the largest ethnic group in China, which also constitutes the world's largest ethnic group. ** Han Taiwanese (): the name for the ethnic group of the Taiwanese p ...
Emperor Jing, was made Prince of Jidong in the sixth year of the middle period of Jing's reign (144 BC). According to the Chinese historian
Sima Qian Sima Qian (; ; ) was a Chinese historian of the early Han dynasty (206AD220). He is considered the father of Chinese historiography for his ''Records of the Grand Historian'', a general history of China covering more than two thousand years b ...
, he would "go out on marauding expeditions with 20 or 30
slave Slavery and enslavement are both the state and the condition of being a slave—someone forbidden to quit one's service for an enslaver, and who is treated by the enslaver as property. Slavery typically involves slaves being made to per ...
s or with young men who were in hiding from the law, murdering people and seizing their belongings for sheer sport". Although many of his subjects knew about these murders, it was not until the 29th year of his reign that the son of one of his victims finally sent a report to the emperor. Eventually, it was discovered that he had murdered at least 100 people. The officials of the court requested that Liu Pengli be executed; however, the emperor could not bear to have his own nephew killed, so Liu Pengli was made a commoner and banished. In the 9th century (year 257 of the Islamic Calendar), "a strangler from Baghdad was apprehended. He had murdered a number of women and buried them in the house where he was living." In the 15th century, one of the wealthiest men in Europe and a former companion-in-arms of
Joan of Arc Joan of Arc (french: link=yes, Jeanne d'Arc, translit= �an daʁk} ; 1412 – 30 May 1431) is a patron saint of France, honored as a defender of the French nation for her role in the siege of Orléans and her insistence on the corona ...
,
Gilles de Rais Gilles de Rais (c. 1405 – 26 October 1440), Baron de Rais (), was a knight and lord from Brittany, Anjou and Poitou, a leader in the French army, and a companion-in-arms of Joan of Arc. He is best known for his reputation and later con ...
, was alleged to have sexually assaulted and killed peasant children, mainly boys, whom he had abducted from the surrounding villages and had taken to his castle. It is estimated that his victims numbered between 140 and 800. The Hungarian aristocrat
Elizabeth Báthory Countess Elizabeth Báthory de Ecsed ( hu, Báthori Erzsébet, ; sk, Alžbeta Bátoriová; 7 August 1560 – 21 August 1614) was a Hungarian noblewoman and alleged serial killer from the family of Báthory, who owned land in the Kingdom o ...
, born into one of the wealthiest families in
Transylvania Transylvania ( ro, Ardeal or ; hu, Erdély; german: Siebenbürgen) is a historical and cultural region in Central Europe, encompassing central Romania. To the east and south its natural border is the Carpathian Mountains, and to the west the ...
, allegedly
torture Torture is the deliberate infliction of severe pain or suffering on a person for reasons such as punishment, extracting a confession, interrogation for information, or intimidating third parties. Some definitions are restricted to acts car ...
d and killed as many as 650 girls and young women before her arrest in 1610. Members of the
Thuggee Thuggee (, ) are actions and crimes carried out by Thugs, historically, organised gangs of professional robbers and murderers in India. The English word ''thug'' traces its roots to the Hindi ठग (), which means 'swindler' or 'deceiver'. Rel ...
cult in India may have murdered a million people between 1740 and 1840. Thug Behram, a member of the cult, may have murdered as many as 931 victims. In his 1886 book, '' Psychopathia Sexualis'', psychiatrist
Richard von Krafft-Ebing Richard Freiherr von Krafft-Ebing (full name Richard Fridolin Joseph Freiherr Krafft von Festenberg auf Frohnberg, genannt von Ebing; 14 August 1840 – 22 December 1902) was a German psychiatrist and author of the foundational work '' Psychopath ...
noted a case of a serial murderer in the 1870s, a Frenchman named Eusebius Pieydagnelle who had a sexual obsession with blood and confessed to murdering six people. The unidentified killer
Jack the Ripper Jack the Ripper was an unidentified serial killer active in and around the impoverished Whitechapel district of London, England, in the autumn of 1888. In both criminal case files and the contemporaneous journalistic accounts, the killer wa ...
, who has been called the first modern serial killer, killed at least five women, and possibly more, in London in 1888. He was the subject of a massive manhunt and investigation by the
Metropolitan Police The Metropolitan Police Service (MPS), formerly and still commonly known as the Metropolitan Police (and informally as the Met Police, the Met, Scotland Yard, or the Yard), is the territorial police force responsible for law enforcement and ...
, during which many modern criminal investigation techniques were pioneered. A large team of policemen conducted house-to-house inquiries, forensic material was collected and suspects were identified and traced. Police surgeon Thomas Bond assembled one of the earliest character profiles of the offender. The Ripper murders also marked an important watershed in the treatment of crime by journalists., While not the first serial killer in history, Jack the Ripper's case was the first to create a worldwide media frenzy. The dramatic murders of financially destitute women in the midst of the wealth of London focused the media's attention on the plight of the urban poor and gained coverage worldwide. Jack the Ripper has also been called the most infamous serial killer of all time, and his legend has spawned hundreds of theories on his real identity and many works of fiction. H. H. Holmes was one of the first documented modern serial killers in the United States, responsible for the death of at least nine victims in the early 1890s. The case gained notoriety and wide publicity through possibly sensationalized accounts in
William Randolph Hearst William Randolph Hearst Sr. (; April 29, 1863 – August 14, 1951) was an American businessman, newspaper publisher, and politician known for developing the nation's largest newspaper chain and media company, Hearst Communications. His flamboyan ...
's newspapers. At the same time in France, Joseph Vacher became known as "The French Ripper" after killing and mutilating 11 women and children. He was executed in 1898 after confessing to his crimes. The majority of documented serial killers in the 20th century are from the United States.


Late 20th century

The serial killing phenomenon in the United States was especially prominent from 1970 to 2000, which has been described as the "golden age of serial murder." The cause of the spike in serial killings has been attributed to
urbanization Urbanization (or urbanisation) refers to the population shift from rural to urban areas, the corresponding decrease in the proportion of people living in rural areas, and the ways in which societies adapt to this change. It is predominantly th ...
, which put people in close proximity and offered anonymity. The number of active serial killers in the country peaked in 1989 and has been steadily trending downward since, coinciding with an overall decrease in
crime in the United States Crime in the United States has been recorded since its founding. Crime rates have varied over time, with a sharp rise after 1900 and reaching a broad bulging peak between the 1970s and early 1990s. After 1992, crime rates began to fall year by ye ...
since that time. The decline in serial killers has no known single cause but is attributed to a number of factors. Mike Aamodt, emeritus professor at Radford University in Virginia, attributes the decline in number of serial killings to less frequent use of
parole Parole (also known as provisional release or supervised release) is a form of early release of a prison inmate where the prisoner agrees to abide by certain behavioral conditions, including checking-in with their designated parole officers, or ...
, improved forensic technology, and people behaving more cautiously. Causes for the general reduction in violent crime following the 1990s include increased
incarceration in the United States Incarceration in the United States is a primary form of punishment and rehabilitation for the commission of felony and other offenses. The United States has the largest prison population in the world, and the highest per-capita incarcerati ...
, the end of the
crack epidemic in the United States The crack epidemic was a surge of crack cocaine use in major cities across the United States throughout the entirety of the 1980s and the early 1990s. This resulted in a number of social consequences, such as increasing crime and violence in Ameri ...
, and decreased lead exposure in early childhood.


Characteristics

Some commonly found characteristics of serial killers include the following: * They may exhibit varying degrees of
mental illness A mental disorder, also referred to as a mental illness or psychiatric disorder, is a behavioral or mental pattern that causes significant distress or impairment of personal functioning. Such features may be persistent, relapsing and remitti ...
or
psychopathy Psychopathy, sometimes considered synonymous with sociopathy, is characterized by persistent antisocial behavior, impaired empathy and remorse, and bold, disinhibited, and egotistical traits. Different conceptions of psychopathy have been ...
, which may contribute to their homicidal behavior. ** For example, someone who is mentally ill may have psychotic breaks that cause them to believe they are another person or are compelled to murder by other entities. ** Psychopathic behavior that is consistent with traits common to some serial killers include sensation seeking, a lack of
remorse Remorse is a distressing emotion experienced by an individual who regrets actions which they have done in the past that they deem to be shameful, hurtful, or wrong. Remorse is closely allied to guilt and self-directed resentment. When a person ...
or guilt,
impulsivity In psychology, impulsivity (or impulsiveness) is a tendency to act on a whim, displaying behavior characterized by little or no forethought, reflection, or consideration of the consequences. Impulsive actions are typically "poorly conceived, prem ...
, the need for control, and predatory behavior.
Psychopaths Psychopathy, sometimes considered synonymous with sociopathy, is characterized by persistent antisocial behavior, impaired empathy and remorse, and bold, disinhibited, and egotistical traits. Different conceptions of psychopathy have been ...
can seem 'normal' and often quite charming, a state of adaptation that
psychiatrist A psychiatrist is a physician who specializes in psychiatry, the branch of medicine devoted to the diagnosis, prevention, study, and treatment of mental disorders. Psychiatrists are physicians and evaluate patients to determine whether their ...
Hervey Cleckley called the " mask of sanity". * They were often
abused Abuse is the improper usage or treatment of a thing, often to unfairly or improperly gain benefit. Abuse can come in many forms, such as: physical or verbal maltreatment, injury, assault, violation, rape, unjust practices, crimes, or other t ...
emotionally, physically, or sexually—by a family member. * Serial killers may be more likely to engage in
fetishism A fetish (derived from the French , which comes from the Portuguese , and this in turn from Latin , 'artificial' and , 'to make') is an object believed to have supernatural powers, or in particular, a human-made object that has power over oth ...
,
partialism Partialism is sexual fetish with an exclusive focus on a specific part of the body other than genitals. Partialism is categorized as a fetishistic disorder in the DSM-5 of the American Psychiatric Association only if it causes significant psyc ...
or
necrophilia Necrophilia, also known as necrophilism, necrolagnia, necrocoitus, necrochlesis, and thanatophilia, is sexual attraction towards or a sexual act involving corpses. It is classified as a paraphilia by the World Health Organization (WHO) in it ...
, which are
paraphilia Paraphilia (previously known as sexual perversion and sexual deviation) is the experience of intense sexual arousal to atypical objects, situations, fantasies, behaviors, or individuals. It has also been defined as sexual interest in anything ot ...
s that involve a strong tendency to experience the object of erotic interest almost as if it were a physical representation of the symbolized body. Individuals engage in paraphilias which are organized along a continuum; participating in varying levels of fantasy perhaps by focusing on body parts (partialism), symbolic objects which serve as physical extensions of the body (fetishism), or the anatomical physicality of the human body; specifically regarding its inner parts and sexual organs (one example being necrophilia). * A disproportionate number exhibit one, two, or all three of the
Macdonald triad The Macdonald triad (also known as the ''triad of sociopathy'' or the ''homicidal triad'') is a set of three factors, the presence of any two of which are considered to be predictive of, or associated with, violent tendencies, particularly with ...
of predictors of future violent behavior: ** Many are fascinated with fire setting. ** They are involved in sadistic activity; especially in children who have not reached sexual maturity, this activity may take the form of torturing animals. ** More than 60 percent, or simply a large proportion, wet their beds beyond the age of 12. * They were frequently bullied or socially isolated as children. For example, Henry Lee Lucas was ridiculed as a child and later cited the mass rejection by his peers as a cause for his hatred of everyone. Kenneth Bianchi was teased as a child because he urinated in his pants, suffered twitching, and as a teenager was ignored by his peers. * Some were involved in petty crimes, such as fraud, theft,
vandalism Vandalism is the action involving deliberate destruction of or damage to public or private property. The term includes property damage, such as graffiti and defacement directed towards any property without permission of the owner. The term ...
, or similar offenses. * Often, they have trouble staying employed and tend to work in menial jobs. The FBI, however, states, "Serial murderers often seem normal; have families and/or a steady job." Other sources state they often come from unstable families. * Studies have suggested that serial killers generally have an average or low-average IQ, although they are often described, and perceived, as possessing IQs in the above-average range.Holloway, Lynette
Of Course There Are Black Serial Killers
. '' The Root''.
A sample of 202 IQs of serial killers had a median IQ of 89. There are exceptions to these criteria, however. For example,
Harold Shipman Harold Frederick Shipman (14 January 1946 – 13 January 2004), known by the public as Doctor Death and to acquaintances as Fred Shipman, was an English general practitioner and serial killer. He is considered to be one of the most prolif ...
was a successful professional (a General Practitioner working for the NHS). He was considered a pillar of the local community; he even won a professional award for a children's asthma clinic and was interviewed by
Granada Television ITV Granada, formerly known as Granada Television, is the ITV franchisee for the North West of England and Isle of Man. From 1956 to 1968 it broadcast to both the north west and Yorkshire but only on weekdays as ABC Weekend Television was it ...
's ''
World in Action ''World in Action'' was a British investigative current affairs programme made by Granada Television for ITV from 7 January 1963 until 7 December 1998. Its campaigning journalism frequently had a major impact on events of the day. Its producti ...
'' on ITV.
Dennis Nilsen Dennis Andrew Nilsen (23 November 1945 – 12 May 2018) was a Scottish serial killer and necrophile who murdered at least twelve young men and boys between 1978 and 1983 in London. Convicted at the Old Bailey of six counts of murder and two of ...
was an ex-soldier turned civil servant and trade unionist who had no previous criminal record when arrested. Neither was known to have exhibited many of the tell-tale signs. Vlado Taneski, a crime reporter, was a career journalist who was caught after a series of articles he wrote gave clues that he had murdered people. Russell Williams was a successful and respected career
Royal Canadian Air Force The Royal Canadian Air Force (RCAF; french: Aviation royale canadienne, ARC) is the air and space force of Canada. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". The RCAF is one of three environm ...
Colonel who was convicted of murdering two women, along with fetish burglaries and rapes.


Development

Many serial killers have faced similar problems in their childhood development. Hickey's Trauma Control Model explains how early childhood trauma can set the child up for deviant behavior in adulthood; the child's environment (either their parents or society) is the dominant factor determining whether or not the child's behavior escalates into homicidal activity. Family, or lack thereof, is the most prominent part of a child's development because it is what the child can identify with on a regular basis. "The serial killer is no different from any other individual who is instigated to seek approval from parents, sexual partners, or others." This need for approval is what influences children to attempt to develop social relationships with their family and peers. "The quality of their attachments to parents and other members of the family is critical to how these children relate to and value other members of society." Wilson and Seaman (1990) conducted a study on incarcerated serial killers, and what they concluded was the most influential factor that contributed to their homicidal activity. Almost all of the serial killers in the study had experienced some sort of environmental problems during their childhood, such as a broken home caused by divorce, or a lack of a parental figure to discipline the child. Nearly half of the serial killers had experienced some type of physical or sexual abuse, and more of them had experienced emotional neglect. When a parent has a drug or
alcohol Alcohol most commonly refers to: * Alcohol (chemistry), an organic compound in which a hydroxyl group is bound to a carbon atom * Alcohol (drug), an intoxicant found in alcoholic drinks Alcohol may also refer to: Chemicals * Ethanol, one of se ...
problem, the attention in the household is on the parents rather than the child. This neglect of the child leads to the lowering of their self-esteem and helps develop a fantasy world in which they are in control. Hickey's Trauma Control Model supports how parental neglect can facilitate deviant behavior, especially if the child sees substance abuse in action. This then leads to
disposition A disposition is a quality of character, a habit, a preparation, a state of readiness, or a tendency to act in a specified way. The terms dispositional belief and occurrent belief refer, in the former case, to a belief that is held in the mind ...
(the inability to attach), which can further lead to homicidal behavior, unless the child finds a way to develop substantial relationships and fight the label they receive. If a child receives no support from anyone, then they are unlikely to recover from the traumatic event in a positive way. As stated by E. E. Maccoby, "the family has continued to be seen as a major—perhaps ''the'' major—arena for socialization".


Chromosomal makeup

There have been studies looking into the possibility that an abnormality with one's
chromosome A chromosome is a long DNA molecule with part or all of the genetic material of an organism. In most chromosomes the very long thin DNA fibers are coated with packaging proteins; in eukaryotic cells the most important of these proteins ar ...
s could be the trigger for serial killers. Two serial killers, Bobby Joe Long and Richard Speck, came to attention for reported chromosomal abnormalities. Long had an extra X chromosome. Speck was erroneously reported to have an extra Y chromosome; in fact, his
karyotype A karyotype is the general appearance of the complete set of metaphase chromosomes in the cells of a species or in an individual organism, mainly including their sizes, numbers, and shapes. Karyotyping is the process by which a karyotype is dis ...
was performed twice and was normal each time. While attempts have been made to link the XYY karyotype to violence, including serial murder, research has consistently found little or no association between violent criminal behaviour and an extra Y chromosome. * * *


Fantasy

Children who do not have the
power Power most often refers to: * Power (physics), meaning "rate of doing work" ** Engine power, the power put out by an engine ** Electric power * Power (social and political), the ability to influence people or events ** Abusive power Power may ...
to control the mistreatment they suffer sometimes create a new reality to which they can escape. This new reality becomes their
fantasy Fantasy is a genre of speculative fiction involving magical elements, typically set in a fictional universe and sometimes inspired by mythology and folklore. Its roots are in oral traditions, which then became fantasy literature and d ...
that they have total control of and becomes part of their daily existence. In this fantasy world, their emotional development is guided and maintained. According to Garrison (1996), "the child becomes
sociopathic Psychopathy, sometimes considered synonymous with sociopathy, is characterized by persistent antisocial behavior, impaired empathy and remorse, and bold, disinhibited, and egotistical traits. Different conceptions of psychopathy have been ...
because the normal development of the concepts of right and wrong and
empathy Empathy is the capacity to understand or feel what another person is experiencing from within their frame of reference, that is, the capacity to place oneself in another's position. Definitions of empathy encompass a broad range of social, co ...
towards others is retarded because the child's emotional and social development occurs within his self-centered fantasies. A person can do no wrong in his own world and the pain of others is of no consequence when the purpose of the fantasy world is to satisfy the needs of one person" (Garrison, 1996). Boundaries between fantasy and reality are lost and fantasies turn to dominance, control, sexual conquest, and violence, eventually leading to murder. Fantasy can lead to the first step in the process of a dissociative state, which, in the words of Stephen Giannangelo, "allows the serial killer to leave the stream of consciousness for what is, to him, a better place".
Criminologist Criminology (from Latin , "accusation", and Ancient Greek , ''-logia'', from λόγος ''logos'' meaning: "word, reason") is the study of crime and deviant behaviour. Criminology is an interdisciplinary field in both the behavioural and so ...
Jose Sanchez reports, "the young criminal you see today is more detached from his victim, more ready to hurt or kill. The lack of empathy for their victims among young criminals is just one symptom of a problem that afflicts the whole society." Lorenzo Carcaterra, author of ''Gangster'' (2001), explains how potential criminals are labeled by society, which can then lead to their offspring also developing in the same way through the
cycle of violence The term cycle of violence refers to repeated and dangerous acts of violence as a cyclical pattern,, This process may be considered an expression of the intersubjectivity associated with a cognitive deficit regarding the capability to make sharp distinctions between other people and inanimate objects. For these individuals, objects can appear to possess animistic or humanistic power while people are perceived as objects. Before he was executed, serial killer
Ted Bundy Theodore Robert Bundy (Name change, born Cowell; November 24, 1946 – January 24, 1989) was an American serial killer who kidnapped, raped and murdered numerous young women and girls during the 1970s and possibly earlier. After more th ...
stated media violence and pornography had stimulated and increased his need to commit homicide, although this statement was made during last-ditch efforts to appeal his death sentence. There are exceptions to the typical fantasy patterns of serial killers, as in the case of
Dennis Rader Dennis Lynn Rader (born March 9, 1945) is an American serial killer known as BTK (an abbreviation he gave himself, for "bind, torture, kill"), the BTK Strangler or the BTK Killer. Between 1974 and 1991, he killed ten people in Wichita and Par ...
, who was a loving family man and the leader of his church.


Organized, disorganized, and mixed

The FBI's ''
Crime Classification Manual ''Crime Classification Manual: A Standard System for Investigating and Classifying Violent Crimes'' (1992) is a text on the classification of violent crimes by John E. Douglas, Ann W. Burgess, Allen G. Burgess and Robert K. Ressler. The publicat ...
'' places serial killers into three categories: ''organized'', ''disorganized'', and ''mixed'' (i.e., offenders who exhibit organized and disorganized characteristics). Some killers descend from being organized into disorganized as their killings continue, as in the case of psychological decompensation or overconfidence due to having evaded capture, or vice versa, as when a previously disorganized killer identifies one or more specific aspects of the act of killing as their source of gratification and develops a ''modus operandi'' that focuses on them. Organized serial killers often plan their crimes methodically, usually abducting victims, killing them in one place and disposing of them in another. They often lure the victims with ploys appealing to their sense of sympathy. Others specifically target prostitutes, who are likely to go voluntarily with a stranger. These killers maintain a high degree of control over the
crime scene A crime scene is any location that may be associated with a committed crime. Crime scenes contain physical evidence that is pertinent to a criminal investigation. This evidence is collected by crime scene investigators (CSI) and law enforcem ...
and usually have a solid knowledge of
forensic science Forensic science, also known as criminalistics, is the application of science to criminal and civil laws, mainly—on the criminal side—during criminal investigation, as governed by the legal standards of admissible evidence and criminal ...
that enables them to cover their tracks, such as burying the body or weighing it down and sinking it in a river. They follow their crimes in the news media carefully and often take pride in their actions as if it were all a grand project. Often, organized killers have social and other interpersonal skills sufficient to enable them to develop both personal and romantic relationships, friends and lovers and sometimes even attract and maintain a spouse and sustain a family including children. Among serial killers, those of this type are in the event of their capture most likely to be described by acquaintances as kind and unlikely to hurt anyone.
Ted Bundy Theodore Robert Bundy (Name change, born Cowell; November 24, 1946 – January 24, 1989) was an American serial killer who kidnapped, raped and murdered numerous young women and girls during the 1970s and possibly earlier. After more th ...
and
John Wayne Gacy John Wayne Gacy (March 17, 1942 – May 10, 1994) was an American serial killer and sex offender who raped, tortured, and murdered at least 33 young men and boys. Gacy regularly performed at children's hospitals and charitable events as " ...
are examples of organized serial killers. In general, the IQs of organized serial killers tend to be normal range, with a mean of 98.7. Disorganized serial killers are usually far more impulsive, often committing their murders with a random weapon available at the time, and usually do not attempt to hide the body. They are likely to be unemployed, a loner, or both, with very few friends. They often turn out to have a history of mental illness, and their
modus operandi A ''modus operandi'' (often shortened to M.O.) is someone's habits of working, particularly in the context of business or criminal investigations, but also more generally. It is a Latin phrase, approximately translated as "mode (or manner) of o ...
(M.O.) or lack thereof is often marked by excessive violence and sometimes
necrophilia Necrophilia, also known as necrophilism, necrolagnia, necrocoitus, necrochlesis, and thanatophilia, is sexual attraction towards or a sexual act involving corpses. It is classified as a paraphilia by the World Health Organization (WHO) in it ...
or sexual violence. Disorganized serial killers have been found to have a lower mean IQ than organized serial killers, at 89.4. Mixed serial killers, with both organized and disorganized traits, have an average IQ of 100.9, but a low sample size.


Medical professionals

Some people with a pathological interest in the power of life and death tend to be attracted to medical professions or acquiring such a job. These kinds of killers are sometimes referred to as "angels of death" or angels of mercy. Medical professionals will kill their patients for money, for a sense of sadistic pleasure, for a belief that they are "easing" the patient's pain, or simply "because they can". Perhaps the most prolific of these was the British doctor
Harold Shipman Harold Frederick Shipman (14 January 1946 – 13 January 2004), known by the public as Doctor Death and to acquaintances as Fred Shipman, was an English general practitioner and serial killer. He is considered to be one of the most prolif ...
. Another such killer was nurse
Jane Toppan Jane Toppan (born Honora Kelley; March 31, 1854 – August 17, 1938), nicknamed Jolly Jane, was an American serial killer who is known to have committed twelve murders in Massachusetts between 1895 and 1901; she confessed to a total of thirt ...
, who admitted during her murder trial that she was sexually aroused by death. She would administer a drug mixture to patients she chose as her victims, lie in bed with them and hold them close to her body as they died. Another medical professional serial killer is
Genene Jones Genene Anne Jones (born July 13, 1950) is an American serial killer, responsible for the deaths of up to 60 infants and children in her care as a licensed vocational nurse during the 1970s and 1980s. In 1984, Jones was convicted of murder and ...
. It is believed she killed 11 to 46 infants and children while working at Bexar County Medical Center Hospital in San Antonio, Texas, United States. She is currently serving a 99-year sentence for the murder of Chelsea McClellan and the attempted murder of Rolando Santos, and became eligible for parole in 2017 due to a law in Texas at the time of her sentencing to reduce
prison overcrowding Prison overcrowding is a social phenomenon occurring when the demand for space in prisons in a jurisdiction exceeds the capacity for prisoners. The issues associated with prison overcrowding are not new, and have been brewing for many years. Dur ...
. A similar case occurred in Britain in 1991, where nurse Beverley Allitt killed four children at the hospital where she worked, attempted to kill three more, and injured a further six over the course of two months. A 21st-century example is Canadian nurse Elizabeth Wettlaufer, who murdered elderly patients in the nursing homes where she worked. William George Davis is another hospital nurse who was sentenced to death in Texas for the murdering of four patients.


Female

Female serial killers are rare compared to their male counterparts., , Sources suggest that female serial killers represented less than one in every six known serial murderers in the United States between 1800 and 2004 (64 females from a total of 416 known offenders), or that around 15% of U.S. serial killers have been women, with a collective number of victims between 427 and 612. The authors of ''Lethal Ladies'', Amanda L. Farrell, Robert D. Keppel, and Victoria B. Titterington, state that "the Justice Department indicated 36 female serial killers have been active over the course of the last century." According to ''The Journal of Forensic Psychiatry & Psychology'', there is evidence that 16% of all serial killers are women. Kelleher and Kelleher (1998) created several categories to describe female serial killers. They used the classifications of '' black widow'', '' angel of death'', ''sexual predator'', ''revenge'', ''profit or crime'', ''team killer'', ''question of sanity'', ''unexplained'', and ''unsolved''. In using these categories, they observed that most women fell into the categories of the black widow or team killer. Although motivations for female serial killers can include attention seeking, addiction, or the result of psychopathological behavioral factors, female serial killers are commonly categorized as murdering men for material gain, usually being emotionally close to their victims, and generally needing to have a relationship with the victim, hence the traditional cultural image of the "black widow". The methods that female serial killers use for murder are frequently covert or low-profile, such as murder by poison (the preferred choice for killing). Other methods used by female serial killers include shootings (used by 20%), suffocation (16%), stabbing (11%), and drowning (5%). They commit killings in specific places, such as their home or a health-care facility, or at different locations within the same city or state. A notable exception to the typical characteristics of female serial killers is Aileen Wuornos, who killed outdoors instead of at home, used a gun instead of poison, and killed strangers instead of friends or family. One "analysis of 86 female serial killers from the United States found that the victims tended to be spouses, children or the elderly". Other studies indicate that since 1975, increasingly strangers are marginally the most preferred victim of female serial killers, or that only 26% of female serial killers kill for material gain only. Sources state that each killer will have her own proclivities, needs and triggers. A review of the published literature on female serial murder stated that "sexual or sadistic motives are believed to be extremely rare in female serial murderers, and psychopathic traits and histories of childhood abuse have been consistently reported in these women." A study by Eric W. Hickey (2010) of 64 female serial killers in the United States indicated that sexual activity was one of several motives in 10% of the cases, enjoyment in 11% and control in 14% and that 51% of all U.S. female serial killers murdered at least one woman and 31% murdered at least one child. In other cases, women have been involved as an accomplice with a male serial killer as a part of a serial killing team. A 2015 study published in ''The Journal of Forensic Psychiatry & Psychology'' found that the most common motive for female serial killers was for financial gain and almost 40% of them had experienced some sort of mental illness.
Peter Vronsky Peter Vronsky is a Canadian author, filmmaker and investigative historian. He holds a PhD in criminal justice history and espionage in international relations from the University of Toronto. He is the author of the bestseller true crime histor ...
in '' Female Serial Killers'' (2007) maintains that female serial killers today often kill for the same reason males do: as a means of expressing rage and control. He suggests that sometimes the theft of the victims' property by the female "black widow" type serial killer appears to be for material gain, but really is akin to a male serial killer's collecting of totems (souvenirs) from the victim as a way of exerting continued control over the victim and reliving it. By contrast, Hickey states that although popular perception sees "black widow" female serial killers as something of the Victorian past, in his statistical study of female serial killer cases reported in the United States since 1826, approximately 75% occurred since 1950.
Elizabeth Báthory Countess Elizabeth Báthory de Ecsed ( hu, Báthori Erzsébet, ; sk, Alžbeta Bátoriová; 7 August 1560 – 21 August 1614) was a Hungarian noblewoman and alleged serial killer from the family of Báthory, who owned land in the Kingdom o ...
is sometimes cited as the most prolific female serial killer in all of history. Formally countess Elizabeth Báthory de Ecsed (Báthory Erzsébet in Hungarian, August 7, 1560 – August 21, 1614), she was a countess from the renowned
Báthory family The Báthory family ( pl, Batory) was a Hungarian noble family of the Gutkeled clan. The family rose to significant influence in Central Europe during the Late Middle Ages, holding high military, administrative and ecclesiastical positions ...
. Before her husband's death, Elizabeth took great pleasure in torturing the staff, by jamming pins under the servant's fingernails or stripping servants and throwing them into the snow. After her husband's death, she and four collaborators were accused of torturing and killing hundreds of girls and young women, with one witness attributing to them over 600 victims, though the number for which they were convicted was 80. Elizabeth herself was neither tried nor convicted. In 1610, however, she was imprisoned in the Csejte Castle, where she remained bricked in a set of rooms until her death four years later. A 2010 article by Perri and Lichtenwald addressed some of the misconceptions concerning female criminality. In the article, Perri and Lichtenwald analyze the current research regarding female psychopathy, including case studies of female psychopathic killers featuring
Münchausen syndrome by proxy Factitious disorder imposed on another (FDIA), also known as fabricated or induced illness by carers (FII), and first named as Munchausen syndrome by proxy (MSbP), is a condition in which a caregiver creates the appearance of health problems in ...
, cesarean section homicide, fraud detection homicide, female kill teams, and a female serial killer.


Juvenile

Juvenile serial killers are rare. There are three main categories that juvenile serial killers can fit into: primary, maturing, and secondary killers. There have been studies done to compare and contrast these three groups and to discover similarities and differences between them. Although these types of serial killers are less common, oftentimes adult serial killers may make their debut at an early age and it can be an opportunity for researchers to study what factors brought about the behavior. While juvenile serial killers are rare, the youngest felon on death row is a juvenile serial killer named Harvey Miguel Robinson who was 17 at the time of his crimes and 18 at the time of his arrest.


Ethnicity and demographics in the United States

The racial demographics regarding serial killers are often subject to debate. In the United States, the majority of reported and investigated serial killers are white males, from a lower-to-middle-class background, usually in their late 20s to early 30s. However, there are African American, Asian, and
Hispanic The term ''Hispanic'' ( es, hispano) refers to people, cultures, or countries related to Spain, the Spanish language, or Hispanidad. The term commonly applies to countries with a cultural and historical link to Spain and to viceroyalties form ...
(of any race) serial killers as well, and, according to the FBI, based on percentages of the U.S. population, whites are not more likely than other races to be serial killers.
Criminal profiler Offender profiling, also known as criminal profiling, is an investigative strategy used by law enforcement agencies to identify likely suspects and has been used by investigators to link cases that may have been committed by the same perpetrator ...
Pat Brown Edmund Gerald "Pat" Brown (April 21, 1905 – February 16, 1996) was an American lawyer and politician who served as the 32nd governor of California from 1959 to 1967. His first elected office was as district attorney for San Francisco, and he w ...
says serial killers are usually reported as white because serial killers usually target victims of their own race, and argues the media typically focuses on "All-American" white and pretty female victims who were the targets of white male offenders; that crimes among minority offenders in urban communities, where crime rates are higher, are under-investigated; and that minority serial killers likely exist at the same ratios as white serial killers for the population. She believes that the myth that serial killers are always white might have become "truth" in some research fields due to the over-reporting of white serial killers in the media. According to some sources, the percentage of serial killers who are African American is estimated to be between 13% and 22%. Another study has shown that 16% of serial killers are African American, what author Maurice Godwin describes as a "sizeable portion". A 2014 Radford/FGCU Serial Killer Database annual statistics report indicated that for the decades 1900–2010, the percentage of white serial killers was 52.1% while the percentage of African American serial killers was 40.3%. In a 2005 article Anthony Walsh, professor of criminal justice at Boise State University, argued a review of post-WWII serial killings in America finds that the prevalence of non-white serial killers has typically been drastically underestimated in both professional research literature and the mass media. As a paradigmatic case of this media double standard, Walsh cites news reporting on white killer Gary M. Heidnik and African-American killer Harrison Graham. Both men were residents of
Philadelphia Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Sin ...
, Pennsylvania; both imprisoned, tortured, and killed several women; and both were arrested only months apart in 1987. "Heidnik received widespread national attention, became the subject of books and television shows, and served as a model for the fictitious Buffalo Bill in '' Silence of the Lambs''", writes Walsh, while "Graham received virtually no media attention outside of Philadelphia, Pennsylvania, despite having been convicted of four more murders than Heidnik".


Outside the United States

There is not much research about serial homicide in non-Western countries, or outside the U.S. In one study of serial homicide in South Africa, many patterns were similar to established patterns in the U.S., with some exceptions: no offenders were female, offenders were lower educated than in the U.S., and both victims and offenders were predominantly black. Beverley Allitt of Grantham, Lincolnshire, a nurse showing symptoms of
Munchausen syndrome Factitious disorder imposed on self, also known as Munchausen syndrome, is a factitious disorder in which those affected feign or induce disease, illness, injury, abuse, or psychological trauma to draw attention, sympathy, or reassurance to ...
claimed 4 young lives and attempted to kill 9 others.


Motives

The motives of serial killers are generally placed into four categories: ''visionary'', ''mission-oriented'', ''hedonistic'', and ''power or control''; however, the motives of any given killer may display considerable overlap among these categories.


Visionary

Visionary serial killers suffer from psychotic breaks with reality, sometimes believing they are another person or are compelled to murder by entities such as the
Devil A devil is the personification of evil as it is conceived in various cultures and religious traditions. It is seen as the objectification of a hostile and destructive force. Jeffrey Burton Russell states that the different conceptions of ...
or God. The two most common subgroups are "demon mandated" and "God mandated". Herbert Mullin believed the American casualties in the
Vietnam War The Vietnam War (also known by other names) was a conflict in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. It was the second of the Indochina Wars and was officially fought between North Vietna ...
were preventing California from experiencing the Big One. As the war wound down, Mullin claimed his father instructed him via
telepathy Telepathy () is the purported vicarious transmission of information from one person's mind to another's without using any known human sensory channels or physical interaction. The term was first coined in 1882 by the classical scholar Frederic ...
to raise the number of "human sacrifices to nature" to delay a catastrophic earthquake that would plunge California into the ocean.
David Berkowitz David Richard Berkowitz (born Richard David Falco, June 1, 1953), also known as the Son of Sam and .44 Caliber Killer, is an American serial killer who pleaded guilty to eight shootings that began in New York City on July 29, 1976. Berkowitz ...
("Son of Sam") may also be an example of a visionary serial killer, having claimed a demon transmitted orders through his neighbor's dog and instructed him to commit murder. Berkowitz later described those claims as a hoax, as originally concluded by psychiatrist David Abrahamsen.


Mission-oriented

Mission-oriented killers typically justify their acts as "ridding the world" of certain types of people perceived as undesirable, such as the
homeless Homelessness or houselessness – also known as a state of being unhoused or unsheltered – is the condition of lacking stable, safe, and adequate housing. People can be categorized as homeless if they are: * living on the streets, also k ...
, ex-cons,
homosexuals Homosexuality is romantic attraction, sexual attraction, or sexual behavior between members of the same sex or gender. As a sexual orientation, homosexuality is "an enduring pattern of emotional, romantic, and/or sexual attractions" to p ...
, drug users, prostitutes, or people of different ethnicity or religion; however, they are generally not psychotic. Some see themselves as attempting to change society, often to cure a societal ill. An example of a mission-oriented killer would be Joseph Paul Franklin, an American
white supremacist White supremacy or white supremacism is the belief that white people are superior to those of other races and thus should dominate them. The belief favors the maintenance and defense of any power and privilege held by white people. White su ...
who exclusively targeted
Jewish Jews ( he, יְהוּדִים, , ) or Jewish people are an ethnoreligious group and nation originating from the Israelites Israelite origins and kingdom: "The first act in the long drama of Jewish history is the age of the Israelites""T ...
,
biracial Mixed race people are people of more than one race or ethnicity. A variety of terms have been used both historically and presently for mixed race people in a variety of contexts, including ''multiethnic'', ''polyethnic'', occasionally ''bi-eth ...
, and
African-American African Americans (also referred to as Black Americans and Afro-Americans) are an ethnic group consisting of Americans with partial or total ancestry from sub-Saharan Africa. The term "African American" generally denotes descendants of ensla ...
individuals for the purpose of inciting a " race war".


Hedonistic

This type of serial killer seeks thrills and derives pleasure and satisfaction from killing, seeing people as expendable means to this goal. Forensic psychologists have identified three subtypes of the hedonistic killer: "lust", "thrill", and "comfort".


Lust

Sex is the primary motive of lust killers, whether or not the victims are dead, and fantasy plays a large role in their killings. Their sexual gratification depends on the amount of torture and
mutilation Mutilation or maiming (from the Latin: ''mutilus'') refers to severe damage to the body that has a ruinous effect on an individual's quality of life. It can also refer to alterations that render something inferior, ugly, dysfunctional, or imper ...
they perform on their victims. The sexual serial murderer has a psychological need to have absolute control, dominance, and power over their victims, and the infliction of torture, pain, and ultimately death is used in an attempt to fulfill their need. They usually use weapons that require close contact with the victims, such as knives or hands. As lust killers continue with their murders, the time between killings decreases or the required level of stimulation increases, sometimes both. Kenneth Bianchi, one of the "
Hillside Strangler The Hillside Strangler, later the Hillside Stranglers, is the media epithet for one, later discovered to be two, American serial killers who terrorized Los Angeles, California, between October 1977 and February 1978, with the nicknames originatin ...
s", murdered women and girls of different ages, races, and appearance because his sexual urges required different types of stimulation and increasing intensity.
Jeffrey Dahmer Jeffrey Lionel Dahmer (; May 21, 1960 – November 28, 1994), also known as the Milwaukee Cannibal or the Milwaukee Monster, was an American serial killer and sex offender who killed and dismemberment, dismembered seventeen men and boys ...
searched for his perfect fantasy lover—beautiful, submissive and eternal. As his desire increased, he experimented with drugs, alcohol, and exotic sex. His increasing need for stimulation was demonstrated by the dismemberment of victims, whose heads and genitals he preserved, and by his attempts to create a "living zombie" under his control (by pouring acid into a hole drilled into the victim's skull). Dahmer once said, "Lust played a big part of it. Control and lust. Once it happened the first time, it just seemed like it had control of my life from there on in. The killing was just a means to an end. That was the least satisfactory part. I didn't enjoy doing that. That's why I tried to create living zombies with acid and the drill." He further elaborated on this, also saying, "I wanted to see if it was possible to make—again, it sounds really gross—uh, zombies, people that would not have a will of their own, but would follow my instructions without resistance. So after that, I started using the drilling technique." He experimented with
cannibalism Cannibalism is the act of consuming another individual of the same species as food. Cannibalism is a common ecological interaction in the animal kingdom and has been recorded in more than 1,500 species. Human cannibalism is well documented, b ...
to "ensure his victims would always be a part of him".


Thrill

The primary motive of a thrill killer is to induce pain or terror in their victims, which provides stimulation and excitement for the killer. They seek the
adrenaline Adrenaline, also known as epinephrine, is a hormone and medication which is involved in regulating visceral functions (e.g., respiration). It appears as a white microcrystalline granule. Adrenaline is normally produced by the adrenal glands and ...
rush provided by hunting and killing victims. Thrill killers murder only for the kill; usually, the attack is not prolonged, and there is no sexual aspect. Usually, the victims are strangers, although the killer may have followed them for a period of time. Thrill killers can abstain from killing for long periods of time and become more successful at killing as they refine their murder methods. Many attempt to commit the
perfect crime Perfect crimes are crimes that are undetected, unattributed to an identifiable perpetrator, or otherwise unsolved or unsolvable as a kind of technical achievement on the part of the perpetrator. The term is used colloquially in law and fiction (es ...
and believe they will not be caught. Robert Hansen took his victims to a secluded area, where he would let them loose and then hunt and kill them. In one of his letters to
San Francisco Bay Area The San Francisco Bay Area, often referred to as simply the Bay Area, is a populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California. The Bay Area is defined by the Association of Bay Area Gov ...
newspapers in San Francisco, California, the
Zodiac Killer The Zodiac Killer is the pseudonym of an unidentified serial killer who operated in Northern California in the late 1960s. The case has been described as the most famous unsolved murder case in American history. It became a fixture of popular c ...
wrote " illinggives me the most thrilling experience it is even better than getting your rocks off with a girl". Carl Watts was described by a surviving victim as "excited and hyper and clappin' and just making noises like he was excited, that this was gonna be fun" during the 1982 attack. Slashing, stabbing, hanging, drowning, asphyxiating, and strangling were among the ways Watts killed.


Comfort (profit)

Material gain and a comfortable lifestyle are the primary motives of comfort killers. Usually, the victims are family members and close acquaintances. After a murder, a comfort killer will usually wait for a period of time before killing again to allow any suspicions by family or authorities to subside. They often use poison, most notably
arsenic Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid. It has various allotropes, ...
, to kill their victims. Female serial killers are often comfort killers, although not all comfort killers are female. Dorothea Puente killed her tenants for their
Social Security Welfare, or commonly social welfare, is a type of government support intended to ensure that members of a society can meet basic human needs such as food and shelter. Social security may either be synonymous with welfare, or refer specifical ...
checks and buried them in the backyard of her home. H. H. Holmes killed for insurance and business profits. Puente and Holmes had previous records of crimes such as theft, fraud, non-payment of debts,
embezzlement Embezzlement is a crime that consists of withholding assets for the purpose of conversion of such assets, by one or more persons to whom the assets were entrusted, either to be held or to be used for specific purposes. Embezzlement is a type ...
and others of a similar nature. Dorothea Puente was finally arrested on a parole violation, having been on parole for a previous fraud conviction.
Contract killers Contract killing is a form of murder or assassination in which one party hires another party to kill a targeted person or persons. It involves an illegal agreement which includes some form of payment, monetary or otherwise. Either party may b ...
("hitmen") may exhibit serial killers traits, but are generally not classified as such because of third-party killing objectives and detached financial and emotional incentives. Nevertheless, there are occasionally individuals that are labeled as both a hitman and a serial killer.


Power/control

The main objective for this type of serial killer is to gain and exert
power Power most often refers to: * Power (physics), meaning "rate of doing work" ** Engine power, the power put out by an engine ** Electric power * Power (social and political), the ability to influence people or events ** Abusive power Power may ...
over their victim. Such killers are sometimes abused as children, leaving them with feelings of powerlessness and inadequacy as adults. Many power- or control-motivated killers sexually abuse their victims, but they differ from hedonistic killers in that rape is not motivated by lust (as it would be with a lust murder) but as simply another form of dominating the victim.
Ted Bundy Theodore Robert Bundy (Name change, born Cowell; November 24, 1946 – January 24, 1989) was an American serial killer who kidnapped, raped and murdered numerous young women and girls during the 1970s and possibly earlier. After more th ...
is an example of a power/control-oriented serial killer. He traveled around the United States seeking women to control.


Media influences

Many serial killers claim that a violent culture influenced them to commit murders. During his final interview,
Ted Bundy Theodore Robert Bundy (Name change, born Cowell; November 24, 1946 – January 24, 1989) was an American serial killer who kidnapped, raped and murdered numerous young women and girls during the 1970s and possibly earlier. After more th ...
stated that
hardcore pornography Hardcore pornography, or hardcore porn, is pornography that features detailed depictions of sexual organs or sexual acts such as vaginal, anal or oral intercourse, fingering, anilingus, ejaculation, and fetish play. The term is in contrast ...
was responsible for his actions. Others idolise figures for their deeds or perceived
vigilante Vigilantism () is the act of preventing, investigating and punishing perceived offenses and crimes without legal authority. A vigilante (from Spanish, Italian and Portuguese “vigilante”, which means "sentinel" or "watcher") is a person who ...
justice, such as
Peter Kürten Peter Kürten (; 26 May 1883 – 2 July 1931) was a German serial killer, known as "The Vampire of Düsseldorf" and the "Düsseldorf Monster", who committed a series of murders and sexual assaults between February and November 1929 in the city o ...
, who idolized
Jack the Ripper Jack the Ripper was an unidentified serial killer active in and around the impoverished Whitechapel district of London, England, in the autumn of 1888. In both criminal case files and the contemporaneous journalistic accounts, the killer wa ...
, or
John Wayne Gacy John Wayne Gacy (March 17, 1942 – May 10, 1994) was an American serial killer and sex offender who raped, tortured, and murdered at least 33 young men and boys. Gacy regularly performed at children's hospitals and charitable events as " ...
and Ed Kemper, who both idolized the actor
John Wayne Marion Robert Morrison (May 26, 1907 – June 11, 1979), known professionally as John Wayne and nicknamed The Duke or Duke Wayne, was an American actor who became a popular icon through his starring roles in films made during Hollywood's Gol ...
. Killers who have a strong desire for fame or to be renowned for their actions desire media attention as a way of validating and spreading their crimes; fear is also a component here, as some serial killers enjoy causing fear. An example is
Dennis Rader Dennis Lynn Rader (born March 9, 1945) is an American serial killer known as BTK (an abbreviation he gave himself, for "bind, torture, kill"), the BTK Strangler or the BTK Killer. Between 1974 and 1991, he killed ten people in Wichita and Par ...
, who sought attention from the press during his murder spree.


In popular culture

Many movies, books, and documentaries have been created, detailing serial killers' lives and crimes. For example, the biographical films ''
Ted Bundy Theodore Robert Bundy (Name change, born Cowell; November 24, 1946 – January 24, 1989) was an American serial killer who kidnapped, raped and murdered numerous young women and girls during the 1970s and possibly earlier. After more th ...
'' (2002) and ''
Extremely Wicked, Shockingly Evil and Vile ''Extremely Wicked, Shockingly Evil and Vile'' is a 2019 American biographical crime drama film about the life of serial killer Ted Bundy. Directed by Joe Berlinger with a screenplay from Michael Werwie, the film is based on Bundy's former gir ...
'' focuses on serial killer
Ted Bundy Theodore Robert Bundy (Name change, born Cowell; November 24, 1946 – January 24, 1989) was an American serial killer who kidnapped, raped and murdered numerous young women and girls during the 1970s and possibly earlier. After more th ...
's personal life in college, leading up to his execution, and '' Dahmer'' (2002) tells the story of
Jeffrey Dahmer Jeffrey Lionel Dahmer (; May 21, 1960 – November 28, 1994), also known as the Milwaukee Cannibal or the Milwaukee Monster, was an American serial killer and sex offender who killed and dismemberment, dismembered seventeen men and boys ...
. A
Netflix series Netflix, Inc. is an American subscription video on-demand over-the-top streaming service and production company based in Los Gatos, California. Founded in 1997 by Reed Hastings and Marc Randolph in Scotts Valley, California, it offers a film ...
on the life of Jeffrey Dahmer and his victims was released in 2022. Serial killers are also portrayed in fictional media, oftentimes as having substantial intelligence and looking for difficult targets, despite the contradiction with the psychological profile of serial killers.


Theories


Biological and sociological

Theories for why certain people commit serial murder have been advanced. Some theorists believe the reasons are biological, suggesting serial killers are born, not made, and that their violent behavior is a result of abnormal brain activity. Holmes believe that "until a reliable sample can be obtained and tested, there is no scientific statement that can be made concerning the exact role of
biology Biology is the scientific study of life. It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field. For instance, all organisms are made up of cells that process hereditary ...
as a determining factor of a serial killer personality." The "Fractured Identity Syndrome" (FIS) is a merging of
Charles Cooley Charles Horton Cooley (August 17, 1864 – May 7, 1929) was an American sociologist and the son of Michigan Supreme Court Judge Thomas M. Cooley. He studied and went on to teach economics and sociology at the University of Michigan, was a found ...
's "
looking glass self The term ''looking-glass self'' was created by American sociologist Charles Horton Cooley in 1902, and introduced into his work ''Human Nature and the Social Order''. It is described as our reflection of how we think we appear to others. Cooley ...
" and
Erving Goffman Erving Goffman (11 June 1922 – 19 November 1982) was a Canadian-born sociologist, social psychologist, and writer, considered by some "the most influential American sociologist of the twentieth century". In 2007 '' The Times Higher Ed ...
's "virtual" and "actual social identity" theories. The FIS suggests a social event, or series of events, during one's childhood results in a fracturing of the personality of the serial killer. The term "fracture" is defined as a small breakage of the personality which is often not visible to the outside world and is only felt by the killer. "Social Process Theory" has also been suggested as an explanation for serial murder. Social process theory states that offenders may turn to crime due to peer pressure, family and friends. Criminal behavior is a process of interaction with social institutions, in which everyone has the potential for criminal behavior. A lack of family structure and identity could also be a cause leading to serial murder traits. A child used as a scapegoat will be deprived of their capacity to feel guilt. Displaced anger could result in animal torture, as identified in the
Macdonald triad The Macdonald triad (also known as the ''triad of sociopathy'' or the ''homicidal triad'') is a set of three factors, the presence of any two of which are considered to be predictive of, or associated with, violent tendencies, particularly with ...
, and a further lack of basic identity.


Military

The "military theory" has been proposed as an explanation for why serial murderers kill, as some serial murderers have served in the military or related fields. According to Castle and Hensley, 7% of the serial killers studied had military experience. This figure may be a proportional under-representation when compared to the number of military veterans in a nation's total population. For example, according to the United States census for the year 2000, military veterans comprised 12.7% of the U.S. population; in England, it was estimated in 2007 that military veterans comprised 9.1% of the population. Though by contrast, about 2.5% of the population of Canada in 2006 consisted of military veterans. There are two theories that can be used to study the correlation between serial killing and military training: ''Applied learning theory'' states that serial killing can be learned. The military is training for higher kill rates from servicemen while training the soldiers to be desensitized to taking a human life. ''Social learning theory'' can be used when soldiers get praised and accommodated for killing. They learn or believe that they learn, that it is acceptable to kill because they were praised for it in the military. Serial killers want accreditation for the work that they have done. In both military and serial killing, the offender or the soldier may become desensitized to killing as well as compartmentalized; the soldiers do not see enemy personnel as "human" and neither do serial killers see their victims as humans. The theories do not imply that military institutions make a deliberate effort to produce serial killers; to the contrary, all military personnel are trained to recognize when, where, and against whom it is appropriate to use deadly force, which starts with the basic '' Law of Land Warfare'', taught during the initial training phase, and may include more stringent policies for military personnel in law enforcement or security.


Investigation


FBI: Issues and practices

In 2008, the
Federal Bureau of Investigation The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States and its principal federal law enforcement agency. Operating under the jurisdiction of the United States Department of Justice, t ...
(FBI) published a handbook titled ''Serial Murder'' which was the product of a symposium held in 2005 to bring together the many issues surrounding serial murder, including its investigation.


Identification

According to the FBI, identifying one, or multiple, murders as being the work of a serial killer is the first challenge an investigation faces, especially if the victim(s) come from a marginalized or high-risk population and is normally linked through forensic or behavioral evidence (FBI 2008). Should the cases cross multiple jurisdictions, the law enforcement system in the United States is fragmented and thus not configured to detect multiple similar murders across a large geographic area (Egger 1998). Ted Bundy was particularly famous for such geographic exploitations. He used his knowledge about the lack of communication between multiple jurisdictions to avoid arrest and detection. The FBI suggests utilizing databases and increasing interdepartmental communication. Keppel (1989) suggests holding multi-jurisdictional conferences regularly to compare cases giving departments a greater chance to detect linked cases and overcome linkage blindness. One such collaboration, the ''Radford/FGCU Serial Killer Database Project'' was proposed at the 2012 FDIAI Annual Conference. Utilizing Radford's Serial Killer Database as a starting point, the new collaboration, hosted by FGCU Justice Studies, has invited and is working in conjunction with other universities to maintain and expand the scope of the database to also include spree and
mass murder Mass murder is the act of murdering a number of people, typically simultaneously or over a relatively short period of time and in close geographic proximity. The United States Congress defines mass killings as the killings of three or more pe ...
s. Utilizing over 170 data points, multiple-murderer
methodology In its most common sense, methodology is the study of research methods. However, the term can also refer to the methods themselves or to the philosophical discussion of associated background assumptions. A method is a structured procedure for br ...
and
victimology Victimology is the study of victimization, including the psychological effects on victims, the relationship between victims and offenders, the interactions between victims and the criminal justice system—that is, the police and courts, an ...
; researchers and Law Enforcement Agencies can build
case studies A case study is an in-depth, detailed examination of a particular case (or cases) within a real-world context. For example, case studies in medicine may focus on an individual patient or ailment; case studies in business might cover a particular fi ...
and statistical profiles to further research the ''Who, What, Why and How'' of these types of crimes.


Leadership

Leadership, or administration, should play a small or virtually non-existent role in the actual investigation past assigning knowledgeable or experienced homicide investigators to lead positions. The administration's role is not to run the investigation but to establish and reaffirm the primary goal of catching the serial killer, as well as provide support for the investigators. The FBI (2008) suggests completing Memorandums of Understanding to facilitate support and commitment of resources from different jurisdictions to an investigation. Egger (1998) takes this one step further and suggests completing mutual aid pacts, which are written agreements to provide support to each other in a time of need, with surrounding jurisdictions. Doing this in advance would save time and resources that could be used on the investigation.


Organization

The structural organization of an investigation is key to its success, as demonstrated by the investigation of Gary Ridgway, the Green River Killer. Once a serial murder case was established, a task force was created to track down and arrest the offender. Over the course of the investigation, for various reasons, the task force's organization was radically changed and reorganized multiple times – at one point including more than 50 full-time personnel, and at another, only a single investigator. Eventually, what led to the end of the investigation was a conference of 25 detectives organized to share ideas to solve the case. The FBI handbook provides a description of how a task force should be organized but offers no additional options on how to structure the investigation. While it appears advantageous to have a full-time staff assigned to a serial murder investigation, it can become prohibitively expensive. For example, the Green River Task Force cost upwards of $2 million per year, and as was witnessed with the Green River Killer investigation, other strategies can prevail where a task force fails. A common strategy, already employed by many departments for other reasons, is the conference, in which departments get together and focus on a specific set of topics. With serial murders, the focus is typically on unsolved cases, with evidence thought to be related to the case at hand. Similar to a conference is an information clearing-house in which a jurisdiction with a suspected serial murder case collects all of its evidence and actively seeks data that may be related from other jurisdictions. By collecting all of the related information into one place, they provide a central point in which it can be organized and easily accessed by other jurisdictions working toward the goal of arresting an offender and ending the murders. Already mentioned was the task force, FBI 2008, Keppel 1989 which provides for a flexible, organized, framework for jurisdictions depending on the needs of the investigation. Unfortunately due to the need to commit resources (manpower, money, equipment, etc.) for long periods of time it can be an unsustainable option. In the case of the investigation of Aileen Wournos, the Marion County Sheriff coordinated multiple agencies without any written or formal agreement. While not a specific strategy for a serial murder investigation, this is certainly a best practice in so far as the agencies were able to work easily together toward a common goal. Finally, once a serial murder investigation has been identified, the use of an FBI Rapid Response Team can assist both experienced and inexperienced jurisdictions in setting up a task force. This is completed by organizing and delegating jobs, by compiling and analyzing clues, and by establishing communication between the parties involved.


Resource augmentation

During the course of a serial murder investigation, it may become necessary to call in additional resources; the FBI defines this as Resource Augmentation. Within the structure of a task force, the addition of a resource should be thought of as either long-term or short-term. If the task force's framework is expanded to include the new resource, then it should be permanent and not removed. For short-term needs, such as setting up roadblocks or canvassing a neighborhood, additional resources should be called in on a short-term basis. The decision of whether resources are needed short or long term should be left to the lead investigator and facilitated by the administration (FBI 2008). The confusion and counter productiveness created by changing the structure of a task force mid investigation is illustrated by the way the Green River Task Force's staffing and structure was changed multiple times throughout the investigation. This made an already complicated situation more difficult, resulting in the delay or loss of information, which allowed Ridgeway to continue killing (Guillen 2007). The FBI model does not take into account that permanently expanding a task force, or investigative structure, may not be possible due to cost or personnel availability. Egger (1998) offers several alternative strategies including; using investigative consultants, or experienced staff to augment an investigative team. Not all departments have investigators experienced in serial murder and by temporarily bringing in consultants, they can educate a department to a level of competence then step out. This would reduce the initially established framework of the investigation team and save the department the cost of retaining the consultants until the conclusion of the investigation.


Communication

The FBI handbook (2008) and Keppel (1989) both stress communication as paramount. The difference is that the FBI handbook (2008) concentrates primarily on communication within a task force while Keppel (1989) makes getting information out to and allowing information to be passed back from patrol officers a priority. The FBI handbook (2008) suggests having daily e-mail or in-person briefings for all staff involved in the investigation and providing periodic summary briefings to patrol officers and managers. Looking back on a majority of serial murderer arrests, most are exercised by patrol officers in the course of their everyday duties and unrelated to the ongoing serial murder investigation (Egger 1998, Keppel 1989). Keppel (1989) provides examples of Larry Eyler, who was arrested during a traffic stop for a parking violation, and Ted Bundy, who was arrested during a traffic stop for operating a stolen vehicle. In each case, it was uniformed officers, not directly involved in the investigation, who knew what to look for and took the direct action that stopped the killer. By providing up-to-date (as opposed to periodic) briefings and information to officers on the street the chances of catching a serial killer, or finding solid leads, are increased.


Data management

A serial murder investigation generates staggering amounts of data, all of which needs to be reviewed and analyzed. A standardized method of documenting and distributing information must be established and investigators must be allowed time to complete reports while investigating leads and at the end of a shift (FBI 2008). When the mechanism for data management is insufficient, leads are not only lost or buried but the investigation can be hindered and new information can become difficult to obtain or become corrupted. During the Green River Killer investigation, reporters would often find and interview possible victims or witnesses ahead of investigators. The understaffed investigation was unable to keep up the information flow, which prevented them from promptly responding to leads. To make matters worse, investigators believed that the journalists, untrained in interviewing victims or witnesses of crimes, would corrupt the information and result in unreliable leads (Guillen 2007).


Memorabilia

Notorious and infamous serial killers number in the thousands and a subculture revolves around their legacies. That subculture includes the collection, sale, and display of serial killer memorabilia, dubbed " murderabilia" by Andrew Kahan, one of the best-known opponents of collectors of serial killer remnants. Kahan is the director of the Mayor's Crime Victims Office in Houston. He is backed by the families of murder victims and "
Son of Sam law A Son of Sam law (also known as a notoriety-for-profit law) is an American English term for any law designed to keep criminals from profiting from the publicity of their crimes, for instance by selling their stories to publishers. Such laws often ...
s" existing in some states that prevent murderers from profiting from the publicity generated by their crimes. Such memorabilia includes the paintings, writings, and poems of these killers. Recently, marketing has capitalized even more upon interest in serial killers with the rise of various merchandise such as
trading card A trading card (or collectible card) is a small card, usually made out of paperboard or thick paper, which usually contains an image of a certain person, place or thing (fictional or real) and a short description of the picture, along with other ...
s,
action figure An action figure is a poseable character model figure made most commonly of plastic, and often based upon characters from a film, comic book, military, video game or television program; fictional or historical. These figures are usually markete ...
s, and books such as ''The Serial Killer Files: The Who, What, Where, How, and Why of the World's Most Terrifying Murderers'' by
Harold Schechter Harold Schechter (born June 28, 1948) is an American true crime writer who specializes in serial killers. He is a Professor Emeritus at Queens College, City University of New York where he taught classes in American literature and myth criticism ...
, and ''The A-Z Encyclopedia of Serial Killers'' by Schecter and David Everitt. Some serial killers attain celebrity status in the way they acquire fans and may have previous personal possessions auctioned off on websites like
eBay eBay Inc. ( ) is an American multinational e-commerce company based in San Jose, California, that facilitates consumer-to-consumer and business-to-consumer sales through its website. eBay was founded by Pierre Omidyar in 1995 and became ...
. A few examples of this are
Ed Gein Edward Theodore Gein (; August 27, 1906 – July 26, 1984), also known as the Butcher of Plainfield or the Plainfield Ghoul, was an American murderer and body snatcher. Gein's crimes, committed around his hometown of Plainfield, Wisconsin, g ...
's 150-pound stolen gravestone and Bobby Joe Long's sunglasses.


See also

*
List of serial killers before 1900 The following is a list of serial killers i.e. a person who murders more than one person, in two or more separate events over a period of time, for primarily psychological reasons''Macmillan Encyclopedia of Death and Dying'' entry o"Serial Killer ...
*
List of serial killers by country This is a list of notable serial killers, by the country where most of the killings occurred. Convicted serial killers by country Afghanistan * Abdullah Shah: killed at least 20 travelers on the road from Kabul to Jalalabad while serving und ...
*
List of serial killers by number of victims A serial killer is typically a person who murders three or more people, in two or more separate events over a period of time, for primarily psychological reasons.A serial killer is most commonly defined as a person who kills three or more peop ...
*
List of songs about or referencing serial killers This is a list of songs about or referencing killers. The songs are divided into groups by the last name of the killer the song is about or mentions. A–B Axeman of New Orleans * "The Mysterious Axman's Jazz (Don't Scare Me Papa)" – Joseph ...
*
Offender profiling Offender profiling, also known as criminal profiling, is an investigative strategy used by law enforcement agencies to identify likely suspects and has been used by investigators to link cases that may have been committed by the same perpetrator. ...
*
Serial crime Serial crimes are crimes of a repetitive nature. Serial murder, serial rape and serial arson are crimes regarded as serial crimes. However, according to criminologists, a habitual offender or a career criminal is not necessarily a serial criminal. ...
* Serial rapist *
Son of Sam law A Son of Sam law (also known as a notoriety-for-profit law) is an American English term for any law designed to keep criminals from profiting from the publicity of their crimes, for instance by selling their stories to publishers. Such laws often ...


Footnotes


Bibliography

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Further reading

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External links


Crime Library's Serial Killer page


Official FBI publication
Dr. James Fallon: The Brains of Serial Killers (Talk)

Unknown Serial Killings
{{DEFAULTSORT:Serial Killer Crimes Abnormal psychology