Montana Homeowner Charged with Deliberate Homicide

Prosecutors say Markus Kaarma and his partner, Janelle Pflager, left the garage door open and a purse out to lure burglars.
2:01 | 05/15/14

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Transcript for Montana Homeowner Charged with Deliberate Homicide
new twist in the case of a teenager killed by a Montana homeowner who found him trespassing. The homeowner has been found guilty of deliberate homicide. Clayton Sandell has the story. Reporter: Marcus kaarma says a dangerous intruder entered his garage just after midnight. So, he grabbed a shotgun. It was a choice between, in his mind, protecting himself and his family. Reporter: The intruder, 17-year-old Darren did, a German foreign exchange student, captured in this surveillance camera image just moments before he was killed. According to new court documents, kaarma's partner told him that burglars had broken into their home. They were on-edge. Reporter: But did could not have been the burglar because two other teenagers have confessed to earlier break-ins. A friend with did that night told police the two were going garage-hopping. That did was only looking for alcohol. In an affidavit charging kaarma with homicide, prosecutors say floeger left that garage door open, a purse with valuables inside as bait. They had to take the law into their own hands, so to speak. They didn't have any other choice. Reporter: Kaarma intends to plead not guilty. Now, his alleged behavior before the shooting is under scrutiny. Investigators say he was overheard days before, in a profanity-laced tirade against those Baltimores. I'm not kidding. I'm going to kill them. Didi has now been laid to rest in Germany. His father says he never wanted to send his son here. America is a dangerous place. For "Good morning America," Clayton Sandell, ABC news, Denver.

This transcript has been automatically generated and may not be 100% accurate.

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