Justin King, 24, is now facing charges of assaulting a corrections officer at the Missoula County Detention Center.
Last week, King was sentenced to 15 years in prison for beating up a man after getting in an argument over a pork chop.
King was being transported to the state prison in Deer Lodge to serve his sentence for assault with a weapon. When he was leaving, he allegedly punched an officer in the face.
The Sheriff's Office says the officer's eye was swollen shut. He was treated at the hospital.
At last week's sentencing, Judge Ed McLean said King's sentence for the previous assault was determined by the violent nature of the crime and his bad behavior in jail, including screaming at officers, fighting with cellmates and urinating on the wall.
The fight happened last October when King and the victim began to argue over a pork chop. The argument escalated and King began striking the victim with a metal rod. County prosecutors pointed out the officer who saw the victim after the attack says he thought the victim was wearing a Halloween mask because off how badly he was beaten.
"You cannot be trusted to live in society without putting members of society at great risk. That's why none of the sentence is suspended, good luck to you," said McLean at the sentencing hearing.
King was also sentenced to undergo anger management and chemical dependency evaluations.