(Waupun) A Waupun Correctional Institutional inmate accused of assaulting a prison guard entered a not guilty plea at arraignment Wednesday. Kevin Russell is facing two felony counts of Battery by Prisoner for the altercation last April along with one count of felony Expelling Bodily Substances for an unrelated incident in July. Russell allegedly head-butted a corrections officers in the groin while he was being detained in the segregation unit. After being secured by other prison guards, the 37-year-old reportedly pushed several officers down a flight of stairs, injuring one guard. No motive was listed in the criminal complaint. If convicted, Russell faces up to an additional 12 years in prison.