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Their homes? >> no, it doesn't. >> reporter: missoula police department detective guy baker had the case. soon he was interviewing the man who'd pulled the trigger. >> hi, markus. >> hello, sir. >> 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. >...

Tool near diren's body. the teenager was unarmed. and another red flag. kaarma said he couldn't see into the garage. but cops talked to the doctors who treated diren, and they examined the shotgun pellet patterns on the garage wall. >> he says he can't see anything. yet he's able to track a moving person in the garage and hits him two out of four times. >> one, two, three, four. >> i didn't believe he was just randomly shooting from right to left. >> and so you're thinking to yourself, this does not look like a justifiable shooting? >> no. at this point, it's-- it's looking like we have a deli...

The teenager was unarmed. and another red flag. kaarma said he couldn't see into the garage. but cops talked to the doctors who treated diren, and they examined the shotgun pellet patterns on the garage wall. >> he says he can't see anything. yet he's able to track a moving person in the garage and hits him two out of four times. >> one, two, three, four. >> i didn't believe he was just randomly shooting from right to left. >> and so you're thinking to yourself, this does not look like a justifiable shooting? >> no. at this point, it's-- it's looking like we have a deliberate homicide. >> repo...

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 police were investigating. >> does that happen...

Soon he was interviewing the man who'd pulled the trigger. >> hi, markus. >> hello, sir. >> 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. an...