Snowmobiler Caleb Moore died Thursday, a week after a crash that has raised new safety concerns about the X Games. He was 25 years old.
Moore, a freestyle snowmobiler, was attempting a backflip at the Winter X Games in Aspen, Colorado, when he couldn't rotate his machine enough to land properly. The skis dug into the lip of the slope, bringing the 450-pound snowmobile crashing down on him. The vehicle slammed into Moore's head and chest.