Editor's note: This article contains graphic descriptions of assault.

BOONVILLE — A former inmate of the Boonville Correctional Center required emergency surgery to remove his spleen after two other inmates allegedly beat and sexually assaulted him in a shower room in September.

Calyb Musgrave, 26, and Derick Dwyer, 39, are each charged in Cooper County as accessories to felony violence to an inmate, assault causing serious physical injury and sodomy. If convicted on the assault charge, they would face sentences of 10 to 30 years or life in prison because the serious injury makes it a Class A felony.

Dwyer and Musgrave allegedly took a 29-year-old inmate into a shower room at the Boonville Correctional Center to repeatedly punch him in the ribs almost daily in September, according to a probable cause affidavit signed by Missouri Department of Corrections Investigator Darren Snellen.

After beating the man Sept. 28, Dwyer and Musgrave pushed a summer sausage into his rectum and made the man keep it there in for 30 minutes. They were caught on camera laughing, high-fiving and hugging in celebration afterwards, Snellen wrote.

Around midnight Sept. 30, less than two days after the alleged assault, the abused inmate reported a medical emergency. As he was being treated, he stopped breathing twice.

When he was moved to the University of Missouri Hospital, he underwent emergency surgery to remove his spleen and appendix. The surgeons found that his spleen was ruptured, his stomach was lacerated and he had bled profusely into his abdomen.

The victim of the alleged assaults was serving a three-year sentence for stealing two computers and crashing a truck he didn’t have permission to drive. He was released under supervised probation two weeks after the alleged assault in Boonville, according to court records.

The inmate is not being identified because he is a victim of sexual assault.

Dwyer is serving his second stint in prison, both for drug charges. He was sentenced to 5 years in prison in 2004 after pleading guilty to charges of manufacturing illegal drugs. In 2014, he was sentenced in St. Louis County to six years in prison after pleading guilty to five felony drug charges.

He is currently being held in the Jefferson City Correctional Center, according to online prison records.

Musgrave is serving seven years for charges stemming from a drunken, high-speed chase with the Missouri State Highway Patrol in 2015 on Interstate 70 in Montgomery County. He crashed through two highway patrol vehicles before another patrolman ran him off the road, according to court records. He is also serving concurrent sentences for several other felonies, including forgery and receiving stolen property.

Musgrave is currently being held at the Potosi Correctional Center, according to online records.

The department declined to answer any questions about the incident or the investigation, spokeswoman Karen Pojmann wrote in an email.

"Our investigation reports and offender medical information are confidential," she wrote.

bcrowley@gatehousemedia.com