( CNN ) -- 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 . `` He will be truly missed and never forgotten , '' his family said in a statement . `` The family wishes to express their deep gratitude for all the prayers and support they have received from all the fans , friends and family around the world that Caleb has inspired . ... Arrangements for a celebration of life are being made and an announcement will be made in the coming days . '' Moore , a freestyle snowmobiler , was attempting a backflip at the Winter X Games in Aspen , Colorado , when he could n'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 . `` We are deeply saddened by Caleb Moore 's passing and our thoughts and prayers go out to his parents , Wade and Michelle , his brother , Colten , and the entire Moore family , '' ESPN , which organizes and televises the X Games , said in a statement . `` He will be remembered for his natural passion for life and his deep love for his family and friends , and he will always be an inspiration to everyone he touched in the action sports community . `` As a result of this accident we will conduct a thorough review of this discipline and adopt any appropriate changes to future X Games . '' The statement added that the X Games have long worked on safety issues and that nevertheless , `` when the world 's best compete at the highest level in any sport , risks remain . Caleb was a four-time X Games medalist attempting a move he has landed several times previously . '' Colten Moore , 23 , was also involved in an accident during Thursday 's event . He was released from the hospital Saturday , according to his Facebook fan page . Caleb Moore 's Facebook page is carrying messages from fans . `` R.I.P . Caleb , '' wrote Candi Clark-Hibbs , adding , `` prayers to your family . '' People we 've lost in 2013 : The lives they lived . CNN 's Josh Levs , Brian Todd , Dugald McConnell , Christine Sever and Shawn Nottingham contributed to this report .
NEW : Caleb Moore brother also suffered an accident in the X Games . Caleb Moore 's died Thursday after a snowmobile crash in the Winter X Games . The crash has raised new safety concerns about the games . R.I.P , which operates the X Games , says it will conduct a thorough review .