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>> 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 ...

Wow? >> absolutely. >> lady in a nice neighborhood, good house. now she's got three bullet wounds. >> on a who-did-it crime. >> back on 307 tudor boulevard, sheriff's cruisers pulled in. with the charred wreckage of the home once filled with joy and laughter, would it now hold clues pointing to a killer. coming up, could julie's murder have been a burglary gone bad? >> something looking for a laptop, jewelry, whatever? >> right. >> and then, this detective spies what could be a critical clue on someone's phone. >> up comes a text message? >> that's correct. >> when "dateline extra" continues...

Recorder catching a quick glimpse of the blaze. then the fire trucks arrived. mack carter received a call in the middle of the night. >> the house was just completely consumed with fire. >> it took about an hour for firefighters to knock down the flames. hours more for them to make their way through the blackened wreckage of the house to what seemed to be the heart of the fire. the master bedroom. ghastly what they would discover. >> coming up, what they found in the embers would rattle the neighborhood and shatter the family. >> everything was just consumed by fire. things were unrecognizable...

Welcome back to "dateline extra." a homeowner was telling a tale of being victimized in his own home. a tale that ended with the death of a german exchange student. now investigators would try to determine if the homeowner's actions were on the right side of the law, or if he crossed the line. we return to josh mankiewicz with "deadly exchange." >> reporter: a high school exchange student from germany had been shot and killed during an apparent burglary inside a neighbor's garage in the quiet town of missoula, montana. now diren dede was dead, and

Welcome back to "dateline extra". i'm tamron hall. a man exercising his rights when he shot an unarmed teenager. but through the course of the investigation, now it was the prosecution's turn to convince the jury that he was a man bent on revenge. here's the conclusion of "deadly exchange." >> marcus karma was on trial for killing an unarmed teen aager i his garage. not only was it unjustified, it was planned unmotivated murder. janell told the jury what she and the defendant had said all along, they were living in fear of intruders.