"My brother never wanted his illness to affect others," Cook, 26, writes on his Celebrity MySpace page. "That was evident in the fact that he wanted his illness to have no part in my experience on Idol, a point he was quite adamant about. So, with that wish in mind, I ran and was involved with the event as an homage to him."
Cook announced the news of his brother Adam's death at the event on Sunday. The 5K race benefited the National Brain Tumor Society and Accelerate Brain Cancer Cure.
Thanks Fans"I want to again thank everyone who donated to the race and continues to donate, sent a kind email, posted thoughts and prayers, called, etc," Cook continues. "I take it as affirmation that my brother was the great man that I knew, and whose ideals I constantly try to uphold in myself. It is with those ideals in tow that I vow to continue to speak out in hopes of raising whatever necessary to help eliminate cancer entirely."
In keeping with his brother's wish that his cancer battle not interfere with Cook's career, the singer says he is forging ahead with a tour. (He will reschedule a show in Toledo, Ohio, originally slated for May 6.)
Acknowledging his fans and their unwavering support, Cook writes, "Thank you to everyone for allowing us, as a family, to grieve and come to terms privately. This event has shown me, beyond doubt, that I have the greatest people in my life, family, friends, and fans alike, and for that, I can never offer enough thanks."
A private funeral is set for Thursday for Adam, who is survived by wife Kendra and their two children.
"It's been a really tough day for Kendra and for the family," said family spokeswoman Julie Henricks. "Even though they know it's coming, it's still hard."