MISSOULA, Mont. - A Montana man accused of fatally shooting a German exchange student in his garage pleaded not guilty to murder Wednesday, Reuters reports. Last month, 29-year-old Markus Kaarma, of Missoula, allegedly shot and killed 17-year-old Diren Dede, of Hamburg, Germany, after the teen broke into his garage. The former U.S. Forest Service firefighter has been charged with deliberate homicide, according to the news agency.