Swayze was killed in a flying accident during flying training at 81CTS. I could find no details of the circumstances of his death.
His brother, Lt William Keith Swayze, also in the RAF, was shot down while with 62Sqn and made POW, repatriated 1919-01-04, but died of natural causes two weeks after he returned home from the war.
Swayze, David Alexander (Cadet)
Killed in Flying Accident 1917-October-06

Birth Date: 1895-April-05
Born:
Parents: William Davis Swayze & Margaret Eleanor Swayze.,
Spouse:
Home: Lindsay, Ontario (parents)
Enlistment:
Enlistment Date: unkown date
Service
RFC
Unit
(OT) FTS- Flying Training School (RFC)
Base
81CTS, Everett, Ontario (Camp Borden)
Rank
Cadet
Position
pilot
Service Numbers
74321, RFC