David Cook is helping his brother's memory live on by raising money for brain cancer research.

A year after his older brother Adam Cook died after battling brain cancer for more than a decade, the seventh-season American Idol champion raised $140,000 for the Race for Hope annual 5K in Washington, D.C. over the weekend, People reported Monday.

"To be able to take this time to honor my brother and everyone who is affected by cancer is huge for me," Cook told People. "It's a great way to help continue the fight Adam started almost 12 years ago."

Overall, the event raised $2.3 million to benefit the National Brain Tumor Society and Accelerate Brain Cancer Cure. In addition to running the 3.1 mile course, Cook also mingled with fans, played in a charity golf event on Friday and took photos with every cancer survivor at the race.

"I came back because the cause is important to me and my family, as well as countless others," Cook told People. "Brain tumors and brain cancer continues to be one of the most under-funded diseases."

Cook served as the grand marshal at last year's race even though it occurred the day after his brother passed away at the age of 37.

"The last year has been a process," Cook told People. "It's all about perspective and remembering what Adam went through so we can work to help avoid anyone else having to do the same."