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Evans Henry Killeen (born February 27, 1936) is an American former professional baseball player. A right-handed pitcher, he worked in four Major League games, all in relief, for the Kansas City Athletics late in the 1959 season. The Brooklyn, New York, native was listed at 6 feet (1.8 m) tall and 190 pounds (86 kg). Killeen was recalled from the Class A Albany Senators of the Eastern League in September 1959. In his four MLB relief appearances, he allowed four hits, four bases on balls, and three earned runs, with one strikeout, in 5⅔ innings pitched.