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William Mapother is Tom Cruise's first cousin! He graduated from the University of Notre Dame as an English major and taught high school for three years before becoming an actor.
He had supporting roles in Mission Impossible II, Born of the fourth of July, and Magnolia.
William had also guest appeared on many shows such as Touched by an Angel, Law & Order: Special Victims Unit, The Inside, Crossing Jordan, and Prison Break.
He is probably most known for his reoccurring role in Lost as Ethan Rom.