''The Mark of a Killer'' (or simply ''Mark of a Killer'') is an American true crime

television series A television show – or simply TV show – is any content produced for viewing on a television set which can be broadcast via over-the-air, satellite television, satellite, or cable television, cable, excluding breaking news, television adverti ...

currently airing on the

Oxygen Network Oxygen (branded on air as Oxygen True Crime) is an American television channel owned by the NBCUniversal Television and Streaming unit of NBCUniversal, a subsidiary of Comcast, through its Cable Entertainment Group subsidiary. The channel primar ...

. The program examines the disturbing behaviors of

serial killer 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 ...

s. As of Season 3, the series is currently titled ''Mark of a Serial Killer''.

Synopsis

Each 45 minutes-long episode follows the story of an investigation guided by the killer’s postmortem signature and features first-hand accounts from detectives and prosecutors who worked on the cases, interviews with criminal psychology experts and with family members and friends of the victims or the perpetrators. The show has regular participants criminal psychologists/experts, like:

Katherine Ramsland Katherine Ramsland (born January 2, 1953) is an American non-fiction author and professor of forensic psychology. Ramsland has written 60 books and more than 1,000 articles, mostly in the genres of crime, forensic science, and the supernatural ...

, Joni E. Johnston and Mark Safarik. Other experts are also appearing in the series for one-one episode like

Michael H. Stone Michael H. Stone, M.D. (born October 27, 1933) is an American psychiatrist and Professor of Clinical Psychiatry at the Columbia University College of Physicians and Surgeons in New York City. Early life and education Stone was born in Syracus ...

Dayle Hinman Dayle Hinman (born September 21, 1952) is a retired, FBI-trained criminal profiler. She starred in a television series on TruTV (earlier known as CourtTV). The program, ''Body of Evidence: From the case files of Dayle Hinman'', documented some ...

Episodes

Season 1 (2019)

Season 2 (2020)

Season 3 (2021)

The tenth episode is longer than the usual (1h 25 min) because it focuses on two separate killers. Also there was a six month break between the fifth and sixth episode.

Season 4 (2022)

References

{{reflist True crime television series Non-fiction works about serial killers Television series about serial killers 2010s American crime television series 2010s American documentary television series Documentary television series about crime in the United States Oxygen (TV channel) original programming