Every chilling retelling was another way to control, to shock, to relive the violence he believed he was entitled to. Watch #SignsOfAPsychopath Sunday on ID. | Investigation Discovery

157K views · 1.2K reactions | From ritual killings to nightmarish rampages, these aren’t horror movies—they’re real crimes that struck on the most feared date in the calendar. Watch "The Friday the 13th Murders" on Wednesday on ID and streaming on @HBOMax. | Investigation Discovery | Facebook

A knock at the door. A basket of flowers. A balloon that said “You’re the Greatest.” And a clown with a revolver. What seemed like a cheerful delivery turned into one of the most shocking crimes in Florida history. Now, People Magazine Investigates revisits the case that stunned the nation. Stream "People Magazine Investigates" on @HBOMax. And watch an all-new season premiere January 12 on ID. #PeopleMagazineInvestigates | Investigation Discovery

Discovery kids: IDs 2013

Growing up, he never knew what his father did for a living. He only knew that his long absences brought a strange sense of relief. Years later, that peace turned to dread. He now believes those trips were cover for something far darker. Watch "Evil Lives Here" Tuesday on ID and stream on @HBOMax. #EvilLivesHere | Investigation Discovery

9.2M views · 48K shares | This 19-year-old's death was ruled a...

He sat across from detectives, calm and emotionless—even as they confronted him about the brutal murder of his own family. Watch #SignsOfAPsychopath Sunday on ID. | Investigation Discovery