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Glenn Cannon (November 21, 1932 – April 20, 2013) was an American actor and educator best known for his roles on Hawaii Five-O and Magnum, P.I. He also appeared on Lost in a pair of different roles. Cannon's career began back to the 1950s with roles in shows like Alfred Hitchcock Presents, The Outer Limits and Combat!. On Magnum, P.I., Cannon was featured as Dr. Ibold, while on Hawaii Five-O, he played Attorney General John Manicote. Wikipedia