O'Malley ni a yàn coadjutor bishop ti awọn Diocese ti Saint Thomas on May 30, 1984, nipa Pope John Paul II. O si gba rẹ episcopal consecration on awọn atẹle August 2 nipa Bishop Edward John Harper, pẹlu Archbishop James Hickey ati Bishop Eugene Marino sise bi co-consecrators. Ìbéèrè: Kí ni James Hickey ká ipo ninu ijo?
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