( CNN ) -- After a weeklong manhunt , authorities have arrested mixed martial arts fighter Jonathan Koppenhaver in Southern California for allegedly beating his ex-girlfriend in Las Vegas . Police captured Koppenhaver , who goes by War Machine , at a motel in Simi Valley on Friday afternoon . He 's originally from the suburb near Los Angeles . `` Inside the room was a small quantity of cash and some pizza , '' the Simi Valley Police said in a statement . Koppenhaver has been on the run since his ex-girlfriend accused him of assault on August 8 , according to CNN affiliate KVVU . At the time , police were called to a Las Vegas home at 4 a.m. and found two people suffering from nonlife-threatening injuries , the affiliate reported . One of the two , adult film actress Christy Mack , said Koppenhaver beat her several times during the August 8 incident , according to the affiliate . In Twitter posts shortly after the alleged attacks , Koppenhaver appeared to address the issue . He said he had gone to the house to surprise Mack with a ring and ended `` up fighting for my life . '' `` I only wish that man had n't been there and that Christy & I would be happily engaged , '' he posted . `` I do n't know y I 'm so cursed . One day truth will come out . '' His tweets two days after the alleged incident do n't say who the man in the house was . `` The cops will never give me fair play , never believe me , '' he posted . `` Still , deciding what to do but at the end of the day , it 's all just heart breaking . '' Koppenhaver is awaiting extradition to Nevada , the affiliate reported . CNN 's AnneClaire Stapleton contributed to this report .
Jonathan Koppenhaver has been on the run for a week . His ex - girlfriend said he assaulted her in Las Vegas last week . Authorities arrested him Friday at a motel in Southern California . ` ` I ' m so cursed , '' he said after the alleged assault .