The Cardinals traded him on April 1, 1967 along with infielder Jerry Buchek and shortstop Tony Martínez to the New York Mets in exchange for shortstop Eddie Bressoud, Danny Napoleon and cash, though he never played for the Mets.
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Mahaffey pitched in two of the games as part of the losing streak, losing a 1–0 game (the first of that losing streak) on a steal of home by Chico Ruiz of the Cincinnati Reds, and was taken out while winning in a game against the Braves in which Rico Carty hit a triple off of reliever Bobby Shantz to win the game.
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