State police say 49 year old Ronny St. Louis went to a home on Forest Avenue in Dover Foxcroft where his ex had been staying.
After talking to her for about 20-minutes on the front lawn, police say he pulled out a gun and shot 50 year old Sherry St. Louis in the right arm.
When she ran inside, Ronny St. Louis killed himself by shooting himself in the head.
Mrs. St. Louis was treated at Mayo Hospital and is expected to be okay.
Police say the couple had been divorced for about two years.