O'Donnell, who was 78, died late Sunday, according to his agent. No cause of death was released.
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He also served as announcer for Oscar and Emmy telecasts and other game shows including 'The Newlywed Game.'
His signature phrase "Wheeeeeeel of Fortune," could be heard on the show from its beginning with host Chuck Woolery in 1975. He worked on the show until 1980, and again from 1988 until his death.