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Steve McGarrett
Alex O'Loughlin

Prior to Hawaii Five-0, Alex O'Loughlin starred in the CBS dramas Moonlight and Three Rivers, as well as CBS Films' The Back-Up Plan, opposite Jennifer Lopez.

O'Loughlin's other film credits include Joel Silver's White Out with Kate Beckinsale, August Rush, The Invisible, The Holiday, and Oyster Farmer. On television, his additional credits include The Shield and the Australian miniseries Mary Bryant.

Born in Canberra, Australia, O'Loughlin studied acting at the National Institute of Dramatic Art in Sydney. Currently, he resides in Hawaii and is actively involved in the charity Donate Life, whose mission is to educate the public on the importance of organ donation. His birth date is August 24.