Guillory, Bell Sentenced for Murder Behind Bars

DENVER – In a brutal display of violence behind bars, Jonathan Guillory, 45, and Anthony Bell, 44, have been sentenced for their roles in the death of a fellow inmate at the U.S. Penitentiary-High in Florence, Colorado.

According to the plea agreements, a violent altercation occurred inside a cell involving Guillory and the victim on December 6, 2021. Guillory repeatedly stabbed the victim with a homemade weapon, including a fatal wound to the base of the throat. Meanwhile, Bell exited the cell and deliberately held the door shut, preventing the victim from escaping or receiving assistance.

Guillory was sentenced to 88 months for voluntary manslaughter, while Bell was handed a 27-month sentence for involuntary manslaughter. The harsh sentences are a stark reminder that violence behind bars will not be tolerated.

“This case underscores our unwavering commitment to safety within the federal prison system,” said United States Attorney Peter McNeilly. “Acts of violence, even behind bars, will be met with serious consequences. These defendants now face significant additional time to reflect on the gravity of their actions and the reach of the law.”

The FBI made it clear that felons will not receive a free pass to commit crimes, even if they are already serving time. “Violence behind bars – whether committed against prison staff or fellow inmates – brings consequences, as this case demonstrates,” said FBI Denver Special Agent in Charge Mark Michalek.

United States District Judge Regina M. Rodriguez sentenced Bell on June 12, 2025, and sentenced Guillory on June 18, 2025. The case was investigated by the Federal Bureau of Investigation, with the prosecution handled by the Violent Crime and Immigration Enforcement Section of the U.S. Attorney’s Office.

The case number for this egregious crime is 1:23-cr-00391-RMR. As the Grimy Times continues to expose the darkest corners of the federal prison system, one thing remains clear: those who commit violence behind bars will be held accountable.