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Presidential debate on sunday night. trump has vowed to continue his campaign in the wake of the release of a 2005 video in which he makes lewd remarks about women. now back to "dateline extra." welcome back to "dateline extra." i'm tamron hall. homeowner markus kaarma told police he was living in a state of fear, but his answers raised more questions. what really happened in that garage, and what was diren dede doing there in the first place. to find out more, they needed to learn more about the german exchange student. here is josh mankiewicz with "deadly exchange." >> reporter: when he wa...

>> they had had their vehicles broken into. she was scared. >> someone had been sneaking into their home, and no someone was in their garage. >> i'm sitting there panicking. like, he's coming at me. >> in a flash, it was over. that charismatic kid, dead on the floor. >> it was terrible. i think i screamed for hours. >> what had happened in that garage that night? >> it was just, like, the last person that would come to my mind. >> a neighbor protecting his home or preparing a trap? >> makes the statement, "it's showtime." >> it's showtime? >> exactly. >> a teenager, a father, a murder. no one ...

Everybody out. they looked everywhere. >> there was considerable pressure, pressure from media, pressure from our administration. everybody wants this thing solved and put away quickly. >> reporter: and then quite suddenly a break. a tipster on the crimestoppers line with a story to tell. >> he had some information that he thought was connected to our murder. >> reporter: a wild goose chase? maybe. and maybe not. >> coming up, the tipster mentioned a detail about the crime. one that gets everyone's attention. >> no one knew that but the two of us. >> when this guy brings it up. >> exactly. >> ...

>> welcome back to "dateline extra." i'm tamron hall. noel stevens murdered shauna. he admitted it. but he also claimed he was told to do it by her husband, george tiaffay. prosecutors had a tough decision to make, and the case hinged on the outcome. here's keith morrison with the conclusion of "under a full moon." reporter: prosecutors marc digiacomo and pam weckerly had a big problem, and they knew it. the problem had a name. noel stevens. greyhound. >> noel is a very important piece of information, but he's also the biggest risk. >> reporter: in the credibility sweepstakes, he's way down ...

Now in the morgue must have had a darker side that many didn't see. detectives decided to dig deeper into the lives of both diren dede and the man who shot him. what they learned would only deepen this mystery. coming up -- >> true or false. diren was committing a crime. >> he was. >> but was diren the only one breaking the law? >> he said, showtime. >> he said janelle makes the statement, it's showtime. >> exactly. >> there would be anger and astonishment on both sides. when "dateline extra" continues. g right by our customers. who's with me? i'm in. i'm in. i'm in. i'm in. ♪ ♪ one, two...