He was killed after a collision with a helicopter (WoM).
Other canon notes and references
Watkins was the "Wizard of the Month" for May 2006 (WoM).
Fabius is a Roman family name deriving from the Latin word faba ("bean") (Behind the Name).
The surname Watkins comes from the pre-seventh century Anglo-Saxon/Germanic name Walter (which derives from Waldhar, meaning "people-rule") (Internet Surname Database).