2x05 Simon Said

When Sam has a vision of a man committing a murder-suicide, Ash helps the brothers track down Andy Gallagher (Gabriel Tigerman), whose mother was killed in the same manner as their own mother—dying in a nursery fire. They head to Guthrie, Oklahoma, and Sam is able to stop the murder, although the man still ends up killing himself. The brothers later locate Andy, and learn that he has mind-control abilities. They believe that Andy forced the man to commit suicide. However, Sam has another vision of a woman's suicide, and it comes to pass while they are talking to Andy, exonerating him. After learning that Andy was adopted and that the woman who killed herself is his biological mother, they conduct research and discover that he has a twin brother named Ansen (Elias Toufexis) that he never knew about. Ansen has been using the same ability out of anger to kill those connected to the adoption that separated them. He targets Andy's ex-girlfriend, and the Winchesters rush to save her. However, Andy ends up killing his twin to save Dean, making Sam realize that every child connected to Azazel seems to end up becoming a killer. After they return to the Roadhouse, Ash reveals that Ansen's adoptive mother did not die when he was an infant, meaning not every psychic child follows a traceable pattern.