Sterling Walter Hayden (born Sterling Relyea Walter) was an American actor, author, sailor and decorated Marine Corps officer and an Office of Strategic Services' agent during World War II. A leading man for most of his career, he specialized in westerns and film noir throughout the 1950s, in films such as John Huston's The Asphalt Jungle (1950), Nicholas Ray's Johnny Guitar (1954), and Stanley Kubrick's The Killing (1956). He became noted for supporting roles in the 1960s, perhaps most memorably as General Jack D. Ripper in Kubrick's Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1964). Hayden's success continued into the New Hollywood era, with roles such as Irish-American policeman Captain McCluskey in Francis Ford Coppola's The Godfather (1972), alcoholic novelist Roger Wade in Robert Altman's The Long Goodbye (1973), and elderly peasant Leo Dalcò in Bernardo Bertolucci's 1900 (1976). With a distinctive "rapid-fire baritone" voice and standing at 6 ft 5 in (196 cm), he had a commanding screen presence in both leading and supporting roles.