He created the sound effects for the car chase in "Bullitt" and the giant ants in "Them!". Billy and his wife Marjorie, who were married 53 years, had one son, William J. Mauch II, named after himself. Billy died, aged 85, in his home in Palatine, Illinois. Bobby Mauch married professional figure skater Georgia "Gigi" Shattuck, whom he first met at the Mar-Ken School in the 1940s, but married in 1971. They had no children. He died, aged 86, at a nursing home in Santa Rosa, California.