An inmate at the Kingfisher County Jail has been found dead and the OSBI has been asked to investigate how the man died.
38 year old William Mallory was found dead in his cell Monday evening.
The state Medical Examiner will have to determine his cause of death.
Mallory had been booked into the jail for theft from a retail store last month.
During the day, Mallory's cell was open to a common area for inmates.