A rising star in American cycling, 17-year-old Magnus White, has died after a driver hit him while he was cycling on the shoulder of a highway in his hometown of Boulder, Colo.

Magnus White, a 17-year-old “rising star” in competitive cycling, has died after being hit by a car in Colorado while he was training for the world championships, the state police and U.S.A. Cycling, the sport’s governing body, said.