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