Dog the Bounty Hunter has vowed to track down a mixed martial arts fighter whose ex-girlfriend posted photos of her swollen and beaten face online, alleging that he brutally assaulted her.

The MMA fighter, who legally changed his name from Jon Koppenhaver to War Machine in 2008, is wanted by Las Vegas police on suspicion of domestic battery, strangulation, assault and coercion.

Duane Chapman, who's better known as reality TV star Dog the Bounty Hunter, took to Twitter this week to say he was coming after Koppenhaver.

Chapman also re-tweeted photos of Koppenhaver's ex-girlfriend Christy Mack with severe facial injuries and bruising following the alleged attack that left her hospitalized.

Koppenhaver has not responded to the Bounty Hunter, but he took to Twitter to defend himself, saying he had showed up at Mack's house on Aug. 8 to propose and ended up "fighting for my life."

Mack, a pornographic film actress, said in a statement posted online that in the early-morning hours of Aug. 8 Koppenhaver showed up to her house and found her with another man.Mack alleges that Koppenhaver assaulted both of them.

Mack said she managed to escape the house and find help following a brutal beating that left her with 18 broken bones around her eyes, a broken nose, a fractured rib, ruptured liver and missing teeth.

A crowdfunding campaign to cover Mack's medical expenses has raised more than $50,000 as of Thursday morning.

Koppenhaver, who has also starred in pornographic films, has run into his own share of legal troubles over the years. In 2012, he was convicted of attempt to commit battery with substantial bodily harm.