- Died when the helicopter in which he was a passenger hit electrical power lines and crashed. He was 30 years old.
- Sued Film Ventures Internatonal chief Edward L. Montoro for profits from Grizzly (1976).
- He was a big fan of Alfred Hitchcock.
- Frequently used music by Lalo Schifrin and Robert O. Ragland.
- His film after The Manitou (1978), "The Overlords". was planned but never started production.
- Sued by Warner Bros., which alleged that Abby (1974) was a rip-off of The Exorcist (1973).
- Worked as a music composer for The Body Shop.
- Died at the age of 30.
- Made radio and TV commercials before making his first film.
- Joined the Air Force at age eighteen. While serving in the Air Force Girdler was stationed in California, where he handled audio/visual services and cut his teeth by working on documentaries and educational films. Moreover, Girdler also served as a hurricane hunter in Puerto Rico prior to embarking on a career as a filmmaker in the early 1970's.
- Buried in his hometown of Louisville, Kentucky. (2000)
- Brother of Lynne Kelly.
- Brother-in-law of J. Patrick Kelly III.
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