Cofield ran into the auto shop, where he collapsed on the floor and was found by officers, police said. He was taken to a hospital, where he died.
Moon was detained at the scene and taken to DeKalb police headquarters for further investigation.
Police previously said a fight between the two men led to the shooting.
“During the altercation, Mr. Moon produced a firearm and shot the victim,” police said in a statement.
A warrant was eventually obtained and he was booked into jail by that evening on a charge of malice murder.