Snowmobiler Caleb Moore has died, his family said in a statement Thursday.

Moore, 25, was competing in the snowmobile freestyle final of the Winter X Games last Thursday in Aspen, Colorado, when he came up short while trying to do a back flip.

The front skis of the machine clipped the landing hill and Moore shot forward over the handlebars. The 450-pound snowmobile struck him as he slid down the hill and the machine tumbled over him.

"He will be truly missed and never forgotten," his family said in a statement.