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Moore, from Krum, Tex., sustained a concussion and a heart contusion last Thursday after he landed short while attempting a backflip during the freestyle event, where competitors have 75 seconds to complete as high-flying aerial stunts on their snowmobiles. The skis on the front of his snowmobile pierced the top of the snow-covered landing ramp, and Moore fell face first into the snow. His bouncing snowmobile, weighing nearly 500 pounds, landed on top of him, knocking him unconscious.

Moore regained consciousness after a couple of minutes, surrounded by paramedics, his father, and his brother, Colten, also a competitor and the X Games gold medalist in the event in 2012. He stood and gingerly walked away, but was taken to a local hospital with a preliminary diagnosis of a concussion.

Early Friday, doctors found bleeding near his heart, and Moore was airlifted to a hospital in Grand Junction, Colo., where he underwent surgery and was listed in critical condition.

On Sunday, a family spokeswoman said that the "cardiac injury has led to a secondary complication involving his brain," but no further details were provided. On Monday, Moore's grandfather, Charles Moore, told The Denver Post, "It's almost certain he's not going to make it."

The Moore family released a statement confirming the death, saying, "The family wishes to express their deep gratitude for all the prayers and support they have received from all the fans, friends and family around the world that Caleb has inspired."

Moore was an accomplished trick artist on four-wheel all-terrain vehicles who, along with his brother, learned how to do similar tricks on snowmobiles in the weeks before the 2010 Winter X Games. Caleb, despite only weeks of practice on the snow, won a bronze medal that year.

ESPN, the organizer of the X Games, also released a statement.

"We are deeply saddened by Caleb Moore's passing and our thoughts and prayers go out to his parents, Wade and Michelle, his brother, Colten, and the entire Moore family. He will be remembered for his natural passion for life and his deep love for his family and friends, and he will always be an inspiration to everyone he touched in the action sports community.

"As a result of this accident we will conduct a thorough review of this discipline and adopt any appropriate changes to future X Games.For 18 years we have worked closely on safety issues with athletes, course designers and other experts. Still, when the world's best compete at the highest level in any sport, risks remain. Caleb was a four-time X Games medalist attempting a move he has landed several times previously."