SAN DIEGO—A 29-year-old one-time X Games BMX star was killed in a motorcycle accident at a Ramona motocross park, authorities reported June 7.

Pat Casey of Riverside was fatally injured shortly before 2:30 p.m. Tuesday when he crashed his dirt bike at The Slayground, a riding center near the intersection of state Route 78 and Sutherland Dam Road, according to the San Diego County Medical Examiner’s Office.

Paramedics tried in vain to revive Casey before pronouncing him dead at the scene.

Casey, who won medals at the 2012 and 2013 X Games, was the first rider to successfully execute elaborate bicycle motocross stunts called the “decade backflip” and “double decade backflip” in competition, according to news accounts.