As he picks up the gun from the floor, it fires.
Police said a patron was struck in the lower leg and was taken to a hospital. The incident happened at about 12.45am local time on June 2 at the Mile High Spirits bar. The agent was taken to police headquarters and later released to a supervisor with the FBI.
Authorities have not said what kind of gun the agent was carrying, or why it accidentally fired. Schepman said he can't say whether the agent had been drinking that night.
Special Agent Amy Sanders, a spokeswoman for the FBI field office in Denver, declined to comment on Bishop's employment status with the agency.
The man who was shot, Tom Reddington, told Good Morning America last week that he and his friends were sitting at one of the tables when he heard "a loud bang" that he thought was a firecracker.
"Then I looked at my leg and see some brown residue . . . I'm still thinking it's a firework . . . all of a sudden from the knee down my leg became completely red," Reddington, 24, said. "And that's when it clicked in my head, 'Oh, I've been shot.' "
Colorado gun laws allow "qualified current and retired law enforcement officers" to carry concealed handguns.