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He murdered his parents when he was 12 years old. A decade later, did he kill again?

At age 12, Rick Ennis confessed to murdering his mother and his stepfather. Thirteen years later, he became the prime suspect in the disappearance of Auburn University honors graduate Lori Slesinski. Years later, Ennis was charged with Slesinski’s murder, even though her body was never found. Did he kill Slesinski? Ennis speaks exclusively with "48 Hours" correspondent Peter Van Sant about killing his parents, and about the disappearance of his friend in "A Man With a Past."