AP
He suffered a concussion from the crash, and later had to have emergency surgery when bleeding developed around his heart.
Yesterday, the AP reported that there had been a complication involving his brain.
The crash came during the snowmobile freestyle competition last week.
Moore under-rotated on an attempted back flip, his snowmobile got stuck on its front skis, and he was thrown in front of the 450-pound machine.
It is the first death in the history of the X Games, but it wasn't the only major injury at this year's competition. A snowboarder fell on his neck attempting to do a triple backflip off a 75-foot jump. And Moore's younger brother Colten separated his pelvis in a snowmobile crash.
Here's video of the crash:
Here's the Moore family's full statement:
This morning Caleb Moore passed away. He will be truly missed and never forgotten.
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.
They would also like to thank the physicians and medical staff at both Aspen Valley Hospital and St. Mary’s Hospital, Grand Junction for their care and dedication.
At this time, the family will not be making any other public statements. They continue to decline interviews. Thank you for continuing to respect the family’s privacy during this difficult time.
Arrangements for a celebration of life are being made and an announcement will be made in the coming days.