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>> chilling details, revealed. >> is this guy dodging us? >> he selected her as his victim. >> towards the bottom of the dig site there was a damaged iphone. >> it looks like maybe clothing, it was just a sinking feeling, really. >> i should play this one that i had with, or i just want to grab her and say, do not do it, do not go. >> hello, and welcome to dateline. college student mackenzie was diving into adulthood, eager to find her path. her family and friends knew her as fun, responsible and always careful. then one night, mackenzie vanished. a trail of electronic clues helped i...

Detectives, he was active on the seeking arrangements site right up until he was arrested. >> even after we made contact with him, he was still on that page, still trying to get a date. >> we don't know why, some selfish jerk used his position on a dating website to somehow ensnare this bright, pretty woman, and for what? >> you look at his profile page, he comes across as a gentleman, somebody that he truly is not. that is the whole cautionary tale is that you never know if they are actually say they are. >> always, she had been surrounded by people who loved her, worried about her, cared abo...

California girl. likes to drink wine, likes to go out, likes to travel, looking for somebody to do that with. >> a little bit more pg than some of them, maybe? >> yeah. >> soon as he founded he sent a screen grab of mackenzie's profile to the salt lake city police department. >> this was definitely another avenue that we had to look at, and track down anybody who might have been in contact with her. >> mckenzie appeared had compartmentalized information about her life. >> the plane ticket to los angeles, for instance had been paid for by man she had met through seeking arrangement, and a 300 d...

Who she was talking to. >> does he fully cooperates? >> definitely. he did. he didn't seem like he had anything to do like this idol. >> because he had an alibi, a very good one actually. as soon as he dropped mackenzie off, surveillance footage at a nearby intersection capture him leaving picking up another fair, the daytime and location all confirmed by the tracking software on these lift apps. >> and he continue that throughout the night, and so -- >> you could eliminate him pretty easily based on the fact that he was elsewhere? >> very quickly, yes. >> she was smiling, she was in good spir...

Around him, evidence of what he did to mckenzie was growing. and finally, october 7th 2020, ayoola ajayi pleaded guilty to murdering mckenzie lueck, and as part of his plea deal he admitted that he thought about killing mackenzie and then planned the killing of mckenzie. a thoroughly pre meditated murder. >> he knew that he was going to murder mackenzie before she even touched down at the airport. >> he selected her as his victim? >> correct. >> was there any explanation at all of what his motivation was to do that? >> none. he never offered any reasoning of why, or even how. >> ayoola ajayi a...