TOPEKA, Kan. (AP) — State and local authorities are investigating the death of a 50-year-old inmate in his cell at the Shawnee County Adult Detention Center.

The Topeka Capital-Journal reports Christopher Alan Clark was arrested at 12:57 a.m. Sunday by Topeka police on drunken driving and other charges.

Clark was found dead shortly after 8 p.m. Sunday, 15 minutes after he was seen standing at his cell door.

The cause of his death had not been determined early Monday. First responders administered CPR and used a defibrillator for about 16 minutes before Clark was pronounced dead.

He was arrested on charges of felony driving under the influence, failure to submit to a drug or alcohol test, refusal of a breathalyzer test, failure to yield to an emergency vehicle and a defective tag light.