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In this photo taken Jan. 25, 2012 and released by ESPN Images, snowmobiler Caleb Moore smiles while attending a news conference at the Winter X Games in Aspen, Colo. Moore was in critical condition on Tuesday, Jan. 29, 2013, in a Colorado hospital after a dramatic crash at the Winter X Games in Aspen, and a relative said the family wasn't hopeful about the 25-year-old's chances for survival. (AP Photo/ESPN Images, Eric Lars Bakke)

Caleb Moore, center, watches practice for Snowmobile Freestyle, January 24, 2013, during the 2013 Winter X Games in Aspen. Freestyle snowmobile athlete Caleb Moore remains in intensive care with heart problems and now a brain complication after a horrible crash Thursday night in the Winter X Games. (Photo By RJ Sangosti / The Denver Post)

Snowmobile Freestyle Caleb Moore smiles during the opening Winter X Games 2012 press conference at Buttermilk Mountain in Aspen on Wednesday, January 25. AAron Ontiveroz, The Denver Post

In this photo taken Jan. 24, 2013, Caleb Moore crashes during the snowmobile freestyle finals at the Winter X Games in Aspen, Colo. (AP Photo/The Colorado Springs Gazette, Christian Murdock)

In a Thursday, Jan. 24, 2013 file photo, Caleb Moore crashes during the snowmobile freestyle finals, during the first day of the X Games Aspen 2013. (AP Photo/The Gazette, Christian Murdock)

In this photo taken Jan. 24, 2013, Caleb Moore lies in the snow after he crashed during the snowmobile freestyle event at the Winter X Games in Aspen, Colo. (AP Photo/The Colorado Springs Gazette, Christian Murdock) MAGS OUT

In this photo taken Jan. 24, 2013, emergency personnel tend to Caleb Moore after he crashed during the snowmobile freestyle event at the Winter X Games in Aspen, Colo. (AP Photo/The Colorado Springs Gazette, Christian Murdock)

Caleb Moore flips beneath his sled during the freestyle snow cross elimination round at Winter X Games 15 at Buttermilk Mountain in Aspen on Thursday, January 27, 2011. AAron Ontiveroz, The Denver Post

Caleb Moore flips his sled during the freestyle snow cross elimination round at Winter X Games 15 at Buttermilk Mountain in Aspen on Thursday, January 27, 2011. AAron Ontiveroz, The Denver Post

Caleb Moore poses for a portrait during the X Games Aspen. X Games Buttermilk Mountain Aspen January 24, 2013 (Photo By AAron Ontiveroz / The Denver Post)