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OKLAHOMA COUNTY, Okla. – Authorities are investigating the death of an inmate at the Oklahoma County Jail.

The Oklahoma State Bureau of Investigation says Ismael Shee Liwanag, 59, was found unresponsive inside the cell he occupied by himself.

Liwanag was transported to a local hospital where he was pronounced dead.

An autopsy will determine the inmate’s cause and manner of death.

Authorities say Liwanag was arrested June 29, 2015, for domestic assault and battery with a dangerous weapon.

At the time of his arrest, he also had warrants for his arrest for violation of a suspended sentence for rape in the first degree by instrumentation.