. >> two hours north up at logan city and then goes partially up to the canyon then returns back to salt, a nervous killer, exhumed her body from the backyard fire pit and reburied her up.? they set off to search logan canyon. >> it took the better part of the day until we found her. >> that's got to be another tough part of your job. >> it was horrific. it was a sight none of us wanted to see. >> the search for mackenzie was over. the investigation was not . in the weeks following, a woman came forward to say she had been sexually assaulted by aj a year earlier. >> at his residence, the same or mackenzie was killed. >> she said she met him through dating app, a religious one. aj was charged with aggravated kidnapping enforceable sexually abuse. evidence of what he did to mackenzie was growing . and, finally, october 7, 2020, ayoola ajayi pleaded guilty to murdering mackenzie lueck. as part of the plea deal, he admitted he thought about killing mackenzie and then he planned the killing of mackenzie . a thoroughly premeditated murder. >> he knew he was going to murder mackenzie before she