Dave Mirra, an X Games biker who used a combination of natural ability, fearlessness and innovation to advance his sport, died Feb. 4 in Greenville, N.C. He was 41.

Greenville police said Mr. Mirra’s body was found with an apparently self-inflicted gunshot wound. Authorities said that they discovered his body in a truck and that Mr. Mirra had been visiting friends in the area.

Mr. Mirra was a giant in the big-air world of action sports, becoming one of the most decorated athletes in X Games history. He began his career in his early teens and broke a number of barriers in his sport, landing the first double backflip in competition at the 2000 X Games in San Francisco.

He received a medal every year at the X Games from 1995 to 2008, winning 14 golds. His 24 career medals were the most in X Games history until Bob Burnquist broke the mark in 2013.

Along the way, Mr. Mirra released a signature shoe with DC Shoes, had two video games that carried his name and became the host of MTV’s “Real World/Road Rules Challenge.”

He was born in Chittenango, N.Y., was married and had two children.