He murdered his parents when he was 12. Did he kill again a decade later?

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.

source https://www.cbsnews.com/news/rick-ennis-murdered-parents-lori-ann-slesinski-disappearance-alabama/