Arkansas Department of Correction inmate William Turner was found dead Sunday morning in his cell at the Tucker Unit just outside of Pine Bluff, according to an ADC news release issued Monday evening.

According to the release, Turner, 46, was found unresponsive in his assigned barracks while officers were conducting a routine security check. Emergency medical treatment was administered on the scene. Turner was pronounced dead at 8:31 a.m. Sunday, the news release said.

The Arkansas State Police was notified and responded to the unit. ASP will be conducting an investigation into the death. The Department of Correction will also be conducting an internal investigation.

Turner was serving a 25-year sentence for manufacture, delivery, or possession of a controlled substance out of Pike County.