But relatives and friends told Channel 2 Action News the victim was 20-year-old Corey Johnson, a 2008 Shiloh graduate.
Detectives were interviewing numerous witnesses that attended the party throughout the day Thursday, police said.
No one answered the door Thursday afternoon at the two-story brick home, but someone inside the home told reporters to leave and threatened to call the police. Address records show the home where the party was held is owned by Erica Qualls.
Neighbor Lynn Trapp told the AJC there are often people on the back deck of the home, but the party she heard Wednesday night was louder.
"It sounded like there were 50 people out there," Trapp said outside her home Thursday afternoon.
Trapp said around 10:30 p.m. Wednesday, she heard the "pow, pow, pow" of gunfire.
"We heard the loud commotion and people yelling and screaming at each other," Trapp said.
Moments later, Trapp said she heard the sirens of police cars arriving in the neighborhood.
Gwinnett officers had been dispatched to the same home four times during the past year, including twice for complaints of loud parties, Smith said Thursday afternoon. In a separate instance, officers were called due to parking violations for those at the house. And neighbors also called police to report possible suspicious activity at the home when the front door was left open, police said.
Please return for updates.