UFC Hall of Fame member and The Ultimate Fighter season 1 finalist Stephan Bonnar passed away at the age of 45.
The official cause of the fighter's death hasn't yet been determined, but the UFC said in a statement that the death came after suspected heart complications.
The UFC family is saddened by the death of UFC Hall of Fame member Stephan Bonnar. We express our sincere condolences to his family and friends.
UFC statement
Bonnar had faced a number of problems in recent years, with the athlete's home being destroyed in a fire in April.
Bonnar had his last fight in November 2014 as part of the Bellator promotion, losing to Tito Ortiz by split decision. In October 2012 at UFC 153, he lost to Anderson Silva by TKO in the first round.