DeForest police say a 25-year-old Monona man has died of the injuries he suffered when he fell from an overpass while trying to help a traffic accident victim.  A 61-year-old driver lost control on Highway 51 Saturday night and struck several guardrails, his car coming to a rest in a traffic lane.  The younger man stopped to help, but he fell onto a road below the overpass while he was trying to get the first driver free.  The driver suffered injuries which weren’t life-threatening, but he has been charged with operating while intoxicated.  No names have been released.  The man who fell died early Sunday morning.