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Sterling married his first wife, Madeline Carroll, on Valentine's Day, 1942, and divorced on May 8, 1946.
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Sterling was 6 feet 5 inches tall.
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Sterling's first publicity picture was in the Boston Traveler newspaper, where he was shown as the winner of a Gloucester, NE fishing boat race in 1938, with the headline "Gloucester Sailor Like Movie Idol."
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Sterling turned down the role of Pike Bishop in The Wild Bunch (1967).
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Sterling was considered for the role of the Fire Captain in Fahrenheit 451 (1966).
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Sterling briefly joined the American Communist Party after making many friends among Communist Yugoslavian partisans during World War Two, but left after seeing the excesses of Stalin and Mao.
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Sterling said he hated acting and only took film work to pay for the different boats he bought over his lifetime.
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Sterling changed his name to "John Hamilton" when he joined the U.S. Marines Corps to avoid his being recognized as a star by other Marines.
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Sterling was married and divorced three times with the same wife, Betty Ann De Noon.
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Sterling was the original choice for knife-thrower character Britt, in The Magnificent Seven (1960), but was unavailable and James Coburn was cast in his place.
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Sterling was given a commendation by Yugoslavia's Marshal Tito for his aid of Yugoslav partisans during World War II.
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Sterling wrote two books, his autobiography "Wanderer" (1963) and a historical novel, "Voyage: A Novel of 1896" (1976).
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Sterling became captain of a ship when he was 19 years old.
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Sterling served in the Marines in World War II and received the Silver Star for service.
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Sterling was nominated for the BAFTA Award for Best Foreign Actor in 1965 for Dr. Strangelove or: How I Learned To Stop Worrying And Love The Bomb (1965).
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Sterling was offered the part of Tarzan in 1953 after Lex Barker retired from the role but refused.
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Sterling was offered the part of Quint in Jaws (1975) but had to turn it down due to problems with the IRS.