A man was killed and another wounded in a stabbing in the South Loop on Sunday afternoon, Chicago police said.Officers responded to reports of a person stabbed in the 1500 block of South Wabash Avenue at 8:50 p.m. and found a man with several stab wounds who died at the scene, police said. Another man, 50, was found with cuts to his arm and bumps on is head. He was taken to Northwestern Memorial Hospital in serious condition.No one is in custody.