SUPERNATURAL Season 7 Episode 15 : Repo Man
Four years ago, Sam and Dean helped a woman named Nora (guest star Nicole Oliver) exorcise a demon that was systematically killing women in a small town. They managed to save the postal worker, Jeffrey (guest star Russell Sams), while vanquishing the demon. However, the return of the same M.O. of killings prompts the brothers to return to town to determine if the demon has returned. While investigating the murders, the brothers visit Jeffrey, whose life had taken a tailspin into a psych ward, though he is now in a halfway house under guardianship. Jeffrey remembers a list of women whom the demon decided to kill, and Dean leaves to find the demon's hideout, while Sam tries to keep an eye on the next victim.