BENTONVILLE, Ark. (KNWA/KFTA) — Benton County jail staff found an unresponsive man in his cell around 2 p.m. on Feb. 3, according to a press release from Sheriff Shawn Holloway.

Inmate Timothy Plank was taken to Northwest Medical Center where he was pronounced dead. An investigation is underway by Benton County Sheriff’s Officer Internal Affairs Division and the Criminal Investigation Division.

Timothy Plank, 53, was found unresponsive at the Benton County jail cell on Feb. 3 after being arrested on Jan. 30, according to Benton County Sheriff’s Office.

Plank was arrested on charges of aggravated robbery, four charges of aggravated assault, aggravated assault on a correctional facility employee, possession of a controlled substance, theft of property, and obtaining drugs by fraud, according to Sheriff Holloway.