This undated photo provided by the Tennessee Bureau of Investigation shows Tennessee Bureau of Investigation Special Agent De’Greaun Frazier. The TBI says Frazier died during a drug investigation in west Tennessee on Tuesday, Aug. 9, 2016. (Tennessee Bureau of Investigation via AP) 
Brenden Tyler Burns is shown in an undated photo provided b by the Tennessee Bureau of Investigation. The Tennessee Bureau of Investigation says Burns, accused of fatally shooting TBI special agent De’Greaun Frazier, has been charged with murder in perpetration of an attempted aggravated robbery. Frazier was shot to death Tuesday, Aug. 9, 2016, during an undercover drug investigation in West Tennessee.JACKSON, Tenn. – Authorities filed charges Wednesday against a man accused of killing a Tennessee Bureau of Investigation special agent during an undercover drug buy.
Brenden Tyler Burns, 23, is charged with murder in the course of an attempted aggravated robbery, the TBI said in a statement.
TBI special agent De’Greaun Frazier was shot to death Tuesday during an undercover drug investigation in west Tennessee.
TBI spokesman Josh DeVine said in a news release that Frazier was working with other agents and narcotics officers on a drug investigation when he met a person for a controlled buy in a car in Jackson.
TBI Director Mark Gwyn said the person drew a gun in an apparent robbery attempt and fired at least once, hitting the agent, who died later at a hospital.