Signs of a Psychopath (2020)

S11E7 I've Got a Criminal Mind

The brutal slaying of an elderly couple sends detectives straight to their doorstep, zeroing in on the teenage grandson who shared their home. After a tense pursuit, they apprehend the 17-year-old, only to unmask a chillingly magnetic psychopath. Beneath his charming facade lies a ravenous appetite for junk food and a cold, simmering need for vengeance that drove him to commit the unthinkable.