KNOXVILLE, Tenn. (WATE) — The Tennessee Bureau of Investigation is investigating the circumstances surrounding a man who died while in the custody of the Knox County Sheriff’s Office.

Allan Thomas Arbach Jr was arrested Wednesday, March 23. The TBI said his arrest was for an outstanding warrant. Arbach was taken to a location along Merchant Drive in Knoxville to be transferred to another jail transport vehicle.

Upon arrival at the transfer site, deputies found Arbach unresponsive in the vehicle. TBI said the deputies began rendering first aid and continued to do so until paramedics arrived.

Arbach was taken to a local hospital where he was pronounced dead. His body has been sent for an autopsy.

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EDITOR’S NOTE: This story will be updated as more information becomes available.