It followed harrowing testimony from Mack, who told the court on Monday that she still fears for her life after her ordeal.
"I don't know if my life will feel complete in 12 years or 30 years and neither do you, but I do know when he gets out he will kill me", said Mack.
Thomas was choked and punched for several minutes while Mack was left with a fractured eye socket, other facial fractures, a lacerated liver, broken ribs and two lost teeth.
In court in March, she said the next thing she remembered after the attack was waking up in the shower without clothes on.
Koppenhaver said at the hearing that he had found God and regrets every day what he has done.
Koppenhaver, who legally changed his name to War Machine during an MMA career in which he went 14-5 while competing for the UFC and Bellator, spoke Monday of his troubled past and sorrowful state of mind. "I was a very, very lost, very empty person", Koppenhaver added in his statement. Koppenhaver was also found guilty of battering the man Mackinday was with that night, Corey Thomas. I've hated the way that I think.
At trial, Koppenhaver's defense mentioned issues he had in his youth, notably a hatred toward his mother. He also threatened to kill her. Koppenhaver was arrested in California after a week-long manhunt. The judge said that she did not think Koppenhaver was "a monster", and that some of his issues stemmed from a hard childhood, but she stated that his actions merited a lengthy sentence.
Although Jonathan may have realized what he did was wrong, the damage done to his ex-girlfriend was vast, and the adult film actress even had to undergo facial reconstruction surgery after Koppenhaver viciously assaulted her.