MILWAUKEE (AP) – Police say an off-duty Milwaukee detective shot a suspect during an armed robbery attempt.  Authorities say the detective was approached by a suspect armed with a handgun who demanded valuables from the officer about 6 p.m. Sunday. The detective pulled out a gun and shot the suspect, who ran from the scene.   Police say the suspect later walked into a nearby grocery store for help. He was taken to a local hospital. His injuries are not believed to be life-threatening.  Officials say the suspect is a 17-year-old Milwaukee resident.