Curiouser and curiouser.

The two Pratt and Whitney engines and propellers made by Hartzell were thoroughly examined and ``no evidence of pre-impact engine or propeller failure was found," the report said...
..Toxicological reports revealed no evidence of drug or alcohol abuse by pilot Richard Conry or the first officer, Michael Guess. The NTSB said based on radio transmissions it believes Conroy was at the controls at the time of the crash.

The report said investigators have documented the crew's activities for three days before the flight through interviews with Conry's wife and Guess's fiancee. They still are reviewing employment, pilot and medical records.