Evil Lives Here 16x01 "He Saved Her Life, Then Took It"

The episode center's on Betty, who has placed her hope in her sister’s son, Chance, to be a positive influence within their turbulent family dynamics. However, Betty soon discovers Chance’s unnerving lack of empathy and his propensity for violent behavior. Chance’s disturbing behavior escalates, ultimately culminating in a devastating act that forever alters their lives.