1x14 Nightmare

Sam has a premonition of a man being killed in Saginaw, Michigan, but the murder is made to look like a suicide. They talk to the victim's son Max (Brendan Fletcher) and fail to find anything supernatural, but warn Max's uncle to be careful. When he, too, dies a mysterious death, Sam and Dean believe the family to be cursed. However, their investigation reveals that Max was regularly beaten by his father and uncle as a child. Sam then has another vision of Max using telekinetic abilities to kill his stepmother, angry at her for not having stopped the abuse. The brothers stop Max, and Sam learns from him that, when he was a baby, his mother also died in the same manner as theirs. When Max's anger suddenly resurfaces, he locks Sam in the closet. Sam receives another premonition, showing Max killing Dean. Trying to escape, Sam manages to telekinetically free himself and talks Max out of killing them. A distraught Max then takes his own life.