The Texas Rangers are conducting an in-custody death investigation at the request of the Nacogdoches County Sheriff Jason Bridges.
The death occurred in the Nacogdoches County Jail Monday morning.
The deceased, identified as Andrew Haffert, 31, had been arrested Sunday night after a SWAT standoff in Nacogdoches.
Haffert allegedly shot a man in the face during a burglary. He was in the Nacogdoches County Jail on a charge of burglary of a habitation.
The gunshot victim is in the hospital in stable condition.
KETK will update this story as more information becomes available.