An autopsy report says an Oklahoma inmate who was reportedly restrained by jail staff in a neck hold died of strangulation.

The Office of the Chief Medical Examiner in Oklahoma said in the report last week that 41-year-old Darius Robinson died from asphyxiation caused by manual compression of the neck in April, while he was held at Caddo County Jail.

The report says Robinson became violent and agitated, and that jailers used pepper spray and placed him in a neck hold to subdue him. Robinson became unresponsive while handcuffed on the floor.

The report doesn't say how the medical examiner knows what happened.

An Oklahoma State Bureau of Investigation report issued in April says Robinson stopped breathing when jailers restrained him. They resuscitated him, but he died at a hospital.