The preliminary investigation has been completed into a fatal car accident that happened in Pawling over the weekend.  The Dutchess County Sheriff's Office says a Jeep operated by 44-year old Jorge Rivera of Poughkeepsie was headed west on Route 55 when it was struck head on by a car operated by 62-year old Robin Shenitsky.  The Pawling woman was pronounced dead at the scene.  Rivera was transported to the hospital with life threatening injuries.  The investigation is continuing, but the Sheriff's Office believes the primary factor appears to be Shenitsky's failure to keep right..  No charges have been filed at this time.  New York State Police, Pawling firefighters and the Dutchess County Medical Examiner assisted at the scene.