Montana Homeowner Accused of Murdering a German Exchange Student

Markus Kaarma claims it was self-defense, but officials allege he lured the victim to his death.
2:19 | 12/01/14

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Transcript for Montana Homeowner Accused of Murdering a German Exchange Student
Now to the trial of a Montana home owner accuse of killing a German exchange student in his garage. Tom llamas is tracking the case. Good morning, Tom. Reporter: Good morning, George. A jury will decide if a Montana man really thought his home and life were in danger or if he was just trigger happy. This morning, jury selection under way in the trial of Montana Marcus karma, accused of killing a German exchange student. The jury will decide if karma, a U.S. Forest service firefighter really thought his home and life were in danger. My client didn't want to kill some kid like that. He feels terrible about this. Reporter: This surveillance camera image captures did. Karma's girlfriend, Janelle flagger, told police they mad been burglarized two times in three weeks. They set up a baby monitor in the garage and installed motion sensors and left the graunl door open with a purse inside as bait for the thieves. One Sunday this past April, the sensors would go off. Alerting karma, who told police he grabbed his shotgun and ran outside. He thought the intruder would come out and harm him so he fired four shots, striking did in the head and the arm. He died. We're outrajd it happened. Especially to someone who loved so dearly. Reporter: Police say two other teens admitted to the previous robberies. Karma was overheard just days before in a profanity-laced tirade against the unknown burglars saying, I'm not kidding. You'll see them on the news. I'm going to kill them. Karma's lawyer claims his client had a right to defend himself under Montana's castle doctrine. It says man's home is his castle. He can use lethal or deadly force the protect that home. Reporter: And karma and his family say there was no baiting here. They were on high alert. The parents of that foreign exchange student are flying in from Germany for the trial.

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

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