Diesel's 'Riddick' unseats Oprah's 'Butler' at box office

By Lisa Richwine and Chris Michaud LOS ANGELES/NEW YORK (Reuters) - Vin Diesel's return as glowing-eyed space traveler "Riddick" won the weekend movie race, ringing up $18.7 million in U.S. and Canadian ticket sales and knocking three-time box office queen Oprah Winfrey to second place. Civil rights drama "Lee Daniels' The Butler," starring Oscar winner Forest Whitaker and media mogul Winfrey, slipped to second, bringing in $8.9 million from Friday through Sunday. ...

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