Ex-UFC fighter "War Machine", who lost last fall at the US Cellular Center here in Cedar Rapids, is on the run. Authorities are looking for War Machine (formerly known as Jon Koppenhaver) for beating up his ex-girlfriend. Now, Dog the Bounty Hunter has been called in on the case and he won't back down. Dog has taken to Twitter advising the fighter to turn himself in to authorities. Fox Sports reports on the altercation and who is offering up $20,000 in reward money.

Michael Loccisano/Getty Images