"Sam, could you do me a favor?" A seemingly simple request sparks the story that has now become part of America’s true crime hall of fame -...

A documentary covering various serial killers including BTK, Jeffrey Dahmer, John Wayne Gacy, Ted Bundy, Son of Sam and more.

He dined with the powerful. He preyed on the vulnerable. Beneath a smiling exterior was the horrifying darkness of a sadistic serial killer.

The chilling story of one of the world’s most notorious serial killers told through the words of Gacy himself, those who were forever changed...