Fond du Lac police are investigating a fatal car versus moped crash Saturday. A preliminary investigation shows a moped operated by 62 year old Thomas Norton of Fond du Lac was at a stop sign on Forest Avenue and failed to yield the right of way while attempting to make a turn to go southbound on South Pioneer Road and was struck by a 1962 Studebaker. Norton was flown by helicopter to ThedaCare Regional Medical Center in Neenah where he later died from his injuries.