WALKER (WKZO) -- 21-year-old Michael Haminger asked his girlfriend's younger brother if he needed help with his homework, and for some reason, the 14-year-old got angry, grabbed a gun out of an unlocked gun cabinet and shot him to death.  It happened in the front yard of the Haminger home on Powers Avenue in Walker, in front of several neighbors.   Now the prosecutor has to decide whether to try the 14-year-old, who has no previous criminal record, as a juvenile or an adult.