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Around the house. >> she didn't want noel in the house anymore. and she said, you know, "you're -- you better get out of this house or i'm calling the police on you." >> reporter: so was he the killer? out at the campsite, detectives did not find any evidence linking him to the murder. so, they kept looking. >> one of the other things big will told us was that noel had a campsite number one and a campsite number two. >> reporter: a second campsite. out there somewhere. but where? and what -- if anything -- was hidden there? >> coming up -- >> under the bush, he saw a pair of jeans that appeare...

Road, and then plowed straight into a cement barrier. the officer follows said he just commit suicide. when "dateline extra" continues. 

Welcome back to "dateline extra." i'm tamron hall. markus kaarma's defense tried to paint a picture of a man exercising his rights when he shot an unarmed teenager. but through the course of the investigation, witnesses offered details that could paint his actions in a whole new light. now it was the prosecution's term to convince the jury he was a man bent on revenge. here's josh mankiewicz with the conclusion of "deadly exchange." >> reporter: markus kaarma was on trial for killing an unarmed teenager in his garage. the prosecution was about to argue that not only was the shooting unjustifie...

>> ten being very honest and >> one and a half, meaning not honest at all. that's correct. >> reporter: george's attorney was itching to cross-examine the habitual liar who'd condemned his client. which presented the prosecutors with a dilemma -- the man at the center of their case against george might just destroy it. >> he could be a real problem. >> he could be a real problem. and there was a substantial amount of discussion between pam and i over whether or not we're calling him or not. >> does that imply that you disagreed? >> oh, yes, we disagreed. >> coming up, a risky decision looks li...

Across new york state, om long island to buffalo, from rochester to the hudson valley, from albany to utica, creative business incentives, infrastrture investment, university partnerships, and the lowest taxes in decades are creating a stronger economy and the right environment in new york state for business to thrive. let us help grow your company's tomorrow- today at business.ny.gov welcome back to "dateline extra." i'm tamron hall. markus kaarma suggested from the night he shot an exchange student that he was acting in self-defense, that he'd been afraid for his life after a series of bur...