He was locked up, awaiting trial for the murder of coffee barista Samantha Koenig. While in custody, he told authorities he'd murdered seven other people. Keyes didn't reveal the identities of all the victims, leaving officials the daunting task of piecing together his chilling past.
Keyes also told detectives about his dual personality, which he claimed to live with for the past 14 years.
"There is no one who knows me or who has ever known me that knows anything about me, really," he says in the clip.
Others, he said, "will tell you something that doesn't line up with anything I tell you, because I'm two different people basically. The only person who knows about what I'm telling you, the kind of things I'm telling you, is me."