McCarthy played varsity football as a sophomore, but then left school to serve in the United States Army Air Corps from 1943 until 1945. When he returned to Penn in 1946, he rejoined the varsity football team as a lineman, and served as captain. He also played first base on Penn's varsity baseball team, serving as its captain in 1948. McCarthy was honored by his senior class as Bowl Man.
After graduation, McCarthy was signed by the St. Louis Browns as an amateur free agent. He made his major league baseball debut on June 19, 1948, as a first baseman with the Browns. He played only the one season.
McCarthy later became an advertising salesman for the Army Times Publishing Co., in New York City. He was living in Freeport, Long Island, at the time of his death in Oceanside, New York, on October 3, 1965.
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