Frank Mir is heading to the world of bare knuckle fighting.
Sources close to the situation confirmed to MMA Fighting that Mir has signed with Bare Knuckle Fighting Championship following an initial report from Fight Bananas.
Mir makes the transition after a professional MMA run that spanned nearly two decades. The 41-year-old made his UFC debut in his third fight at UFC 34 in November 2001. After a 5-1 start in the octagon, Mir became the UFC heavyweight champion for the first time after submitting Tim Sylvia in just under a minute at UFC 48.