David Cook's Brother Dies of Cancer

David Cook's older brother died after a long battle with brain cancer on Saturday, according to the former "American Idol" winner's official Web site.

Adam Cook, a lawyer, was 36. He had struggled with the disease for 11 years.

VIEW THE PHOTOS: David Cook: From 'American Idol' To Rock Star

On Sunday morning, David made the announcement of his brother's death at the 12th Annual Race for Hope 5K run/walk in Washington, D.C., which benefited finding a cure for brain cancer. He served as the event's honorary chairman.

"I actually lost my brother yesterday, to a brain tumor," he told a stunned crowd in a video of the event posted on YouTube.

VIEW THE PHOTOS: Former 'American Idols'

"Idol" fans may remember Adam from his emotional appearance last year on the reality competition, when he watched David perform Mariah Carey's "Always Be My Baby" in the audience. David went on to win the contest during the show's seventh season, beating out competitor David Archuleta.

Related Content from AccessHollywood.com:
VIEW THE PHOTOS: David Cook Visits Access
PLAY IT NOW: Behind The Scenes: David Cook's 'Come Back To Me' Music Video Shoot
PLAY IT NOW: David Cook Talks New Album
 

MORE ACCESS ON THESE TOPICS: David Cook - Deaths - American Idol - Celebrities - Music
 

Copyright NBCAH - Access Hollywood
Contact Us