Aurora Theater shooter James Holmes was assaulted by a fellow inmate in prison earlier this month.

A Colorado Department of Corrections spokesman confirmed on Saturday that the convicted killer was assaulted sometime in October by a fellow prisoner named Mark Daniels, 27, at the Colorado State Penitentiary, reports KUSA. The incident occurred as the two inmates were being moved in a hallway in the prison. That's when Daniels lunged at Holmes and took a couple swings at him. Holmes, however, was not hurt.

"It was not an attack, it was a very minor incident in passing in a hallway," Adrienne Jacobson, a spokeswoman for the Colorado Department of Corrections, told CNN.

Jacobson also told The Denver Post that Daniels will be charged with assault on Holmes and on a correctional officer. According to The Post, Daniels is serving time for menacing, auto theft, assault and smuggling contraband into prison. Prior to assaulting Holmes, Daniels had been eligible for parole in February 2017, according to a Department of Corrections online database.

Back in August, Judge Carlos A. Samour ordered Holmes to serve 12 consecutive life terms without parole, plus 3,318 years behind bars. The 28-year-old mass murderer was convicted for fatally shooting 12 people while injuring 70 others inside of an movie theater showing "The Dark Knight" in July 2012.

During the sentencing hearing, Samour described Holmes as an angry quitter who gave up on life and made a conscious choice to redirect his hatred onto innocent strangers.

"Eventually, the defendant quit on life. Had he just quit on life, it would have affected him and him alone. Perhaps his parents, perhaps his family, and that would have been the end of it. But he didn't just quit. He decided since he was quitting, he was going to take people with him," Samour said, according to The Associated Press.