An inmate died at an Arizona prison Saturday and authorities said it is being investigated as a homicide.

Arizona Department of Corrections officials say 50-year-old Jereme Cosby died Saturday after being found unresponsive in his shared housing unit at the State Prison Complex-Lewis in Buckeye.

They said prison staff attempted life-saving measures, but Cosby was declared dead by responding paramedics.

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Authorities in Arizona are investigating the death of an inmate at the State Prison Complex-Lewis in Buckeye as a homicide.

Corrections officials said an investigation of Cosby’s death will be conducted by criminal investigators.

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Cosby had been in an Arizona prison since 2005 after he was sentenced out of Mohave County for first-degree murder.