Idol David Cook's Brother Dies Of Cancer

After battling cancer for more than a decade, David Cook's brother, Adam, died Saturday, the American Idol winner announced Sunday morning before the Race for Hope 5K in Washington, D.C.

"I actually lost my brother yesterday to a brain tumor and I couldn't imagine being anywhere else right now," Cook, 26, told the crowd at the benefit for brain cancer research (see video above). Cook was both serving as grand marshal and running with a team that raised $97,000.

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