Milwaukee police say a man who was walking his dog in the downtown area early Sunday morning killed a man who attacked him from behind. No names have been released in the incident which happened at about 3:40 A-M. Investigators took the man who says he was attacked in for questioning. Witnesses say police restricted access to an area encompassing several blocks for about three hours while they collected evidence. The man who died was said to be in his 30’s. Police haven’t said how he was killed. No charges have been filed.