The Behavioral Analysis Unit (BAU) travels to Boston to investigate the return of a notorious serial killer, , who had stopped killing 10 years prior. The killer had previously made a "deal" with the lead detective on the case to stop his spree if the investigation was dropped. When that detective dies, The Reaper begins killing again to reclaim his "power". Key Character: The Reaper (George Foyet)
is the 18th episode of the fourth season of the police procedural drama Criminal Minds . It is a pivotal episode in the series as it introduces George Foyet , also known as The Reaper , who becomes one of the most significant and recurring antagonists in the show's history. Plot Overview [S4E18] Omnivore
: The BAU identifies him as an "omnivore," meaning he does not target a specific victim type. He is described as a highly disciplined predator who kills anyone to maintain a sense of dominance and recognition. The Behavioral Analysis Unit (BAU) travels to Boston