Inmate Convicted in Beating Death of Fellow Prisoner

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An inmate at the Iowa State Penitentiary has been found guilty of voluntary manslaughter in the beating death of a fellow prisoner, 64-year-old Gary Showalter, during a work assignment in the prison kitchen in December 2024. 35-year-old Anthony Michael Koehlhoeffer is expected to be sentenced later this month and faces up to 10 years in prison.

Why it matters

Violent incidents between inmates are an ongoing concern within the U.S. prison system, highlighting the challenges of maintaining safety and security behind bars. This case will likely renew discussions around prison reform, inmate rehabilitation programs, and the need for better monitoring and intervention to prevent such tragedies.

The details

Koehlhoeffer was convicted of beating Showalter to death while the two were working together in the prison kitchen in December 2024. Voluntary manslaughter carries a maximum sentence of 10 years in the Iowa Department of Corrections, with no mandatory minimum prior to parole eligibility. Koehlhoeffer was originally serving time for a 2010 robbery at a Fairfield bank.

• The incident occurred in December 2024 while Koehlhoeffer and Showalter were working in the prison kitchen.
• Koehlhoeffer was found guilty in March 2026 and is expected to be sentenced later this month.

What’s next

The judge will determine Koehlhoeffer's sentence later this month, which could range up to 10 years in prison.