The older brother of American Idol champ David Cook has lost his battle with brain cancer, according to the singer's official website. Adam Cook, 37, had battled cancer for more than a decade, including throughout Cook's bid for the American Idol crown last year. The Terre Haute, Ind., lawyer had even flown out to L.A. amid chemotherapy treatment to see his brother, 26, take the Idol stage. The brothers had one of AI's most memorable, tear-worthy moments ever, when Adam sat in the audience in April 2008 and watched David perform his rendition of Mariah Carey's "Always Be My Baby." It was a commitment that didn't go unnoticed by the judges. Simon Cowell, too, offered his condolences. "I was incredibly saddened to hear the news," he said in a statement to PEOPLE. "I met Adam Cook a few times at American Idol . He was an incredible guy, and right now my thoughts are with David and his family."