Educated at the Pratt Institute, Brooklyn-born Bill Williams broke into performing as a professional swimmer. Williams went on to work as a singer/actor in regional stock and vaudeville before making his film bow in 1943. After World War II service, he was signed by RKO Radio Pictures, which gave him the star buildup with such 1946 releases as Till the End of Time and Deadline at Dawn. Also in 1946, he wed another RKO contractee, Barbara Hale, with whom he co-starred in A Likely Story (1948) and Clay Pigeon (1949). His film career on the wane in the early 1950s, Williams signed up to star in the weekly TV western The Adventures of Kit Carson, which ran from 1952 to 1955. After the cancellation of Kit Carson, he remained active in television starring opposite Betty White in the 1955 sitcom Date with the Angels and showing off his athletic and aquatic prowess in the 1960 Sea Hunt clone Assignment: Underwater. He stayed active into the 1980s, playing rugged character roles. Bill Williams was the father of actor William Katt, star of the 1980s adventure weekly The Greatest American Hero.