Police said Marlowe was approached by a young black male wearing a light blue shirt, and was shot once.
The incident occurred in a populated area during a busy time of day (about 5:00 to 5:30 p.m.), police said. It's possible that witnesses have not come forward, and also possible that witnesses did not realize that what they saw is important.
Marlowe was able to give police a description of the shooter before being transported to the hospital.
Anyone with information should call Gwinnett Police detectives at 770-513-5300. Also, callers can remain anonymous when contacting Crime Stoppers (404-557-TIPS) and still be eligible for a reward of up to $2,000 for information leading to an arrest and indictment.