Topic summary
Renée Rienne

Extracted from the Wikipedia article List of Alias characters.
Anna Espinosa
The first encounter APO personnel had with the transformed Anna occurred in Ghana in the episode "30 Seconds" and resulted in her killing freelance operative Renée Rienne before escaping. In the following episode ("I See Dead People"), Anna is ordered to intercept the real Sydney, who is en route to contact Michael Vaughn. Anna tries to deceive Vaughn, but he realizes she is an imposter, though he does not know her true identity. They fight, but as Anna gains the upper hand, she is shot in the back and head by Sydney, who had just arrived at the scene. Sydney subsequently impersonates Anna within Prophet Five for a brief time, initially convincing Sloane she (Anna) had killed Sydney by shooting her in the back. Sloane conspired to kill Anna as he felt Sydney did not deserve to die that way, but subsequently realized Sydney was impersonating her, first by doubts as Sloane notices the passion behind how Sydney (impersonating Anna) talks to him and later confirmed when Sydney told Sloane "I don't die that easy" inside a prison cell after Sydney meets with The Rose. Apparently, Prophet Five considered Anna either disposable or too dangerous to their plans to keep alive, as they planned to kill her once she fulfilled her duties foreseen by Rambaldi as the Chosen One (namely retrieving an artifact from San Cielo).