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he's coming after me. >> in a flash, it was over. >> that charismatic kid dead on the floor. >> fits -- it was terrible, i think i screamed for an hour. >> what happened in that garage that night? >> it was 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 showtime? >> exactly. >> a teenager, a father, a murder, no one would be the same. >> we were all taken aback. >> welcome to dateline. he came to america as an adventurous exchange student, but he took one risk too many and it cost him his ...

That's why you left the purse. >> the purse was for them to take the they went come into the house. so i could call the plays and say, here is something traceable. >> so, an open door and a person plain sight. the prosecutor said janelle and her husband set the stage, and waited and watched. so, when diren wafted, they weren't scared. they were excited. >> she was like, showtime. >> on the stand, janelle denied saying those words. >> do you remember saying, showtime, when he saw something outside? >> no, i don't remember saying the. [inaudible] >> in court, janelle change her story over what s...

Was his death a case of someone acting in self-defense, a homeowner protecting his family and property, or something far more deliberate? here's josh mankiewicz with "deadly exchange." >> reporter: it's a dilemma that confronts every teenager. how to simultaneously fit in with your friends and rebel against everyone else. that two-step is made a little easier by the knowledge, maybe the certainty, that you're going to live forever. >> kids do dumb stuff all the time. >> reporter: and so sneaking out of the house in the dead of night to meet other teenagers to drink, party or just hang out well...

>> i'm guy baker. i'm a detective. >> reporter: the homeowner was markus kaarma. kaarma and his common law wife, janelle pflaeger, had just moved to missoula. they were looking for a quiet, safe and kid-friendly place to raise their child. police spoke with janelle at the scene and recorded their talk with kaarma at the station. >> so what we want to talk about is what happened tonight at your house. >> reporter: the couple told investigators the story actually began with a burglary three weeks earlier. and then just ten days after that, the burglars returned. >> somebody had trespassed in the...

>> you wanted to catch him. that's why you got the purse. >> the purse was for them to take so they didn't come into the house and so that when i called the police and i say here is something traceable. >> reporter: so an open door, and a purse in plain sight. the prosecutor said janelle and her husband set the stage, then waited and watched. so when diren walked in, they weren't scared, they were excited. >> she's like, show time. >> reporter: on the stand, janelle denied saying those words. >> do you remember saying, "showtime," when you saw somebody outside? >> no, i don't remember saying t...