Michael Peters, 49, of Lilburn, died Wednesday from the injuries he received June 16.
Cpl. Brian Kelly of the Gwinnett County Police Department said a passer-by saw Peters in the parking lot of the Brentwood Downs Apartments on Lake Knoll Drive and called 911.
Officials said it appeared Peters had been beaten and then set on fire.
No arrests have been made.
Anyone who witnessed or has information regarding the incident is urged to call Gwinnett County Police at 770-513-5300 or Crime Stoppers at 404-577-8477.