The bureau says the two deputies who were injured Monday are undergoing medical treatment.
Knott says the inmate fled the courthouse, and then suffered a gunshot wound.
Two deputies with the Coffee County, Tennessee Sheriff's Office have been injured in a shooting at the county courthouse.
Lucky Knott, public information officer for the Coffee County Sheriff's Department, said he was not aware of Bell being on supervised release at the time the charges were brought against him. Knott says the suspect may have shot himself.
Bell was in court on charges of kidnapping, evading arrest, possession of a controlled substance, domestic assault and multiple counts of reckless endangerment with a motor vehicle, according to court dockets.
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Bassett went to a third floor holding cell to transport Bell back to the jail after a morning court hearing, Northcott said. Bell then reportedly attacked the deputy, and a scuffle ensued. Officials said the deputy was wearing a bulletproof vest. Knott said one deputy was shot in the stomach.
Both deputies and the shooter were taken to the hospital.
As Bell exited the courthouse, he shot deputy Wendell Bowen, in what Northcott described as a "very unnecessary and cowardly way". Deputy Bassett was later transported to Vanderbilt University Medical Center from Erlanger Medical Center in Chattanooga. They were last listed in stable condition.
Officials with the TBI confirmed that the suspect has died from his injuries.
Manchester resident PJ Stewart, 23, said saw someone run out of the courthouse who was barefoot and appeared to have a weapon. Gwyn also said there were no other suspects being sought in the case.