According to his arrest warrant, Brandt shot James Allen Ross multiple times in the upper torso. Ross, 38, died from his injuries. Investigators said they believe Ross was targeted.
It was not known Monday whether Brandt was ever employed at the printing company. The company did not respond to an emailed request seeking comment on the shooting.
Brandt, who lives in Gainesville, was being held without bond Monday at the Gwinnett jail, booking records show.
Friday’s shooting came less than two weeks after the city of Suwanee reported its first homicide since 2012.
On July 27, officers were called to the Residences at McGinnis Ferry shortly before 9 a.m., Thompson previously said. There, they found Petty dead from what appeared to be multiple stab wounds, Thompson said.
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Petty was a recent graduate of North Gwinnett High School and lived at the complex, according to investigators. Police believe he was targeted and that he knew his attacker.
Investigators were still seeking evidence in the case Monday, and tipsters were encouraged to come forward with information. There were no security cameras in the area where Petty was killed, Thompson said.
In addition to the Crime Stoppers Atlanta reward of $2,000, Petty’s family has contributed an additional $8,000, bringing the reward to $10,000, police said.
Anyone with information on the case is asked to contact Suwanee detectives at 470-360-6735. To remain anonymous, tipsters can contact Crime Stoppers at 404-577-TIPS (8477) or visit www.stopcrimeATL.com.