"I had to make it seem like we were better friends than we actually were."

In today's true crime documentary, we're covering the case of Sarah Stern.

VIDEO QUALIFICATIONS: The following interrogation has been analyzed by a qualified team, including a licensed attorney and former Criminal Prosecutor and a licensed clinical psychologist.

Watch "The Disturbing Case of the Scream Killers":    • The Disturbing Case of the Scream Kil...