Beloved White House staffer Jake Brewer, of Alexandria, died Sept. 19, after losing control of his bike at a sharp curve during the Ride to Conquer Cancer. President Obama is one of many who have offered their condolences. (WUSA9)

A White House staff member was killed Saturday in Howard County while taking part in a bicycle ride to raise money to combat cancer.

Police said Jacob Thomas Brewer, 34, of Alexandria, died in the Mount Airy area about 3:40 p.m. when his bicycle went out of control at a sharp curve on Old Frederick Road. It crossed the double yellow line and collided with an oncoming vehicle, police said.

The Web site for the Ride to Conquer Cancer reported “a fatal accident involving” a participant in the two-day, 150-mile ride, which began Saturday in the District. The Web site had warned that roads would be open to traffic.

Brewer’s mother said he was in the fundraising ride because of a close friend who was a cancer patient. He “lived life large and tended to live life for other people,” Lori Brewer Collins said.

On the White House Web site, Brewer, known as Jake, is listed as a senior policy adviser in the Office of the Chief Technology Officer, which is part of the Office of Science and Technology Policy.

The ride would go on, Brewer’s mother said. He was a man who could “make things happen,” she said, and that was what “he would have wanted.”

Opening ceremonies for the ride were scheduled for 7 a.m. Saturday at RFK Stadium, where the ride was to conclude Sunday.