The Mono County Sheriff's Office confirmed his death Monday in a statement. The cause of death is being investigated, but authorities say foul play is not suspected.
Chelone Miller, of Easton, N.H., was hoping to make the U.S. squad in snowboardcross for the 2014 Sochi Games. Nicknamed Chilly, Miller recently finished fourth at the 2013 U.S. Snowboarding Grand Prix in Canyons, Utah.
In addition to competing, Miller also did some filming with Warren Miller and other production companies.
Bode Miller is a five-time Olympic medalist in alpine skiing. He sat out the 2012-13 World Cup season while recovering from a knee injury.