D-N-A evidence has helped Green Bay Police solve three sexual assault cold cases.  Investigators say they had no good leads until D-N-A from the attacker in those cases was entered into the national D-N-A database.  The break came last October when Dunn County investigators submitted D-N-A from a sexual assault case they were working.  It not only matched the Green Bay case from 2011, it also matched an assault in Chicago.  Police aren’t releasing the name of the 56-year-old suspect because he’s not in custody hasn’t been charged yet.