How Did Gordon Avil Die?

Gordon Avil was an American cinematographer. He worked in Billy the Kid (1930), The Champ (1931), A Miracle Can Happen (1948), Robot Monster (1953), Shield for Murder (1954), King Dinosaur (1955), Big House, U.S.A. (1955), The Black Sleep (1956) and The Underwater City (1962). According to Robert Clary, he was one of the most patient and endearing people he ever met. He died in April 1970 of a heart attack while on vacation from shooting the TV series Hogan's Heroes.