Muldoon returned to the Rosebuds after the Metropolitans folded in the spring of 1924. He followed most of his players to the NHL when most of the Rosebuds were sold to Major Frederic McLaughlin to start the Chicago Black Hawks. He accepted the position because his wife Dorothy was a Chicago native and pregnant with the family's second child. After the Black Hawks ended the 1926–27 season with a playoff berth after finishing in third place in the American Division with a 19–22–3 record, he resigned because of constant meddling from McLaughlin.