The Fulton County Medical Examiner early Tuesday identified the boy as 16-year-old Alexander Koser.
Authorities say 46-year-old Eric Brandon has been charged with shooting Koser, his stepson, after an argument.
Milton Police Capt. Shawn McCarty says Brandon was arrested and charged with his stepson's killing after a fight at their Milton townhouse.
McCarty said Koser was shot three times with a 12-gauge shotgun after the argument, and he was pronounced dead at the scene.
It was not immediately known whether Brandon had a defense attorney, and messages to the family on Sunday were not returned.
(Copyright 2012 by The Associated Press. All Rights Reserved.)
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