I believe he was flying a Long-EZ when he went down.
He sure was:
"Singer-songwriter and actor John Denver died when his Long-EZ crashed on October 12, 1997, just off the coast at Pacific Grove, California. The NTSB believes that he inadvertently pushed on his right rudder pedal while twisting to the left in his seat as he struggled to operate the fuel selector valve, which on his aircraft had been moved by a previous owner to a position where it could more easily be reached from the passenger seat.[23] Contributing factors in the Denver crash were other pilot errors, a design that led to an overly optimistic pre-flight fuel-check estimate,[24] a known defective fuel valve that was very hard to turn, and non-standard placement of the fuel selector valve by the kit plane's builder, at variance with Burt Rutan's specifications. Denver was aware of the relocated valve prior to take off and had previously flown the aircraft only for approximately thirty minutes in an orientation flight the day before the accident, although he was an experienced pilot. The NTSB cited Denver's unfamiliarity with the aircraft and his failure to have the aircraft refueled as causal factors in the accident.[23] The aerodynamics of this unusual aircraft did not play a role in Denver's crash."
