The 25-year-old was performing a flip when he landed short and went over the handlebars. The snowmobile rolled over him. He walked off the course and went to the hospital, where he developed bleeding around his heart.
On Sunday, members of his family said he had a secondary complication involving his brain, but did not give details.
Caleb’s grandfather, Charles Moore, told the Denver Post on Monday that the prognosis was “not good.”
“It’s almost certain he’s not going to make it,” Charles Moore told the newspaper.
"Caleb is in critical condition and is being closely monitored," family spokeswoman Chelsea Lawson said Tuesday. "The Moores want to express their gratitude to all of Caleb's fans, friends and family for their strong support and ask for continued prayers in the coming days. The family will not be making any other public statements for the time being. Thank you for respecting the family's privacy during this difficult time."