( CNN ) -- Mixed martial arts fighter Jonathan Koppenhaver , who is accused of beating up his ex-girlfriend , tried to kill himself in a Las Vegas jail , authorities said . Koppenhaver , 32 , is known as War Machine on the MMA circuit . He allegedly beat adult film actress Christy Mack and a male friend on August 8 -- then went on the run . Police captured him a week later in his hometown of Simi Valley , California . He 's been held at the Clark County Detention Center since then . A corrections officer conducting checks at the detention center found him unresponsive in his cell on Tuesday , according to CNN affiliate KSNV . Suicide note . He was found seated on the floor with a torn piece of linen around his neck , which was attached to his bunk , Officer Jose Hernandez told the affiliate . Koppenhaver , who was unresponsive and struggling to breathe , had left behind a suicide note . Hernandez cut the linen and called medical personnel , who later cleared the fighter and put him on suicide watch at a medical isolation unit . Details of his suicide note were not released . The incident occurred on the same day he was supposed to appear in court to discuss a plea deal , according to the affiliate . ' I 'm so cursed ' Koppenhaver has said that he 'd gone to surprise his ex-girlfriend with a ring when he found her with another man . `` I only wish that man had n't been there and that Christy & I would be happily engaged , '' he posted on Twitter in August . `` I do n't know y I 'm so cursed . One day truth will come out . '' He is facing various charges , including domestic battery and attempted murder . CNN 's Greg Morrison contributed to this report .
Jonathan Koppenhaver leaves behind a suicide note . His ex-girlfriend says he assaulted her in August . `` I 'm so cursed , '' he says after the alleged assault .