The Twitter accounts of many athletes from a wide range of sports expressed their sympathy for Caleb Moore. (AP Photo/ESPN Images, Eric Lars Bakke)
The X Games will no longer feature snowmobile or Moto X best trick competitions.
ESPN, which sanctions and televises the X Games, announced the cancellations on Tuesday.
The decision comes after two horrific snowmobiling incidents last January in Aspen, Colo., including the death of Caleb Moore from injuries he sustained when his 450-pound sled rolled over him after a backflip gone wrong during a freestyle competition.
The death was the first in the 18-year history of the X Games.
Later in best trick, a snowmobiling newcomer fell off his machine and the throttle stuck, sending it veering into the crowd.
The X Games still plans to hold other snowmobile events at Winter X, along with motorcycle competitions at Summer X.
In a statement, ESPN said it will focus on sports disciplines that feature "athletes who also compete in multiple, world-class competitions."