Vincent Perotta, portrayed by Patrick Kilpatrick, in Natural Born Killer (S1, Ep 8)
Vincent Perotta was a serial killer with the perfect job – he was a hit man. He only killed men though (killing his father over and over again), but he was thrown off his game when there was a woman at his last job – he brutally tortured and murdered the men, but the woman, he killed her quickly with no torture. This brought him to the attention of the BAU and once they had him in custody, we got a tantalizing piece of Hotch backstory – his father physically abused him! We also met Agent Kramer from the Baltimore Field Office and found out that the actor portraying him was once under consideration for the role of Hotch. WTF?!?!