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Mike Howard is 6 feet tall, 190 pounds, has blue eyes, gray/brown hair and a long gray beard. He was wearing a yellow T-shirt, shorts and Keen water shoes. Anyone with information that might help in the search for Howard is asked to contact National Park Service Silent Witness Line at 928-638-7840. (NPS)

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Grand Canyon river rafter missing after trying to aid wife

A California man remains missing four days after trying to rescue his wife during a river rafting trip in the Grand Canyon.