McMillan is survived by his mother, Katrina Mateen. She told WLOX-TV that when she arrived at the store after her son was shot, officers handcuffed her and led her across the street.
Gulfport police said in a news release that the shooting occurred after they responded to a 911 call about several juveniles brandishing weapons at other motorists. The officers pulled the minors over to the parking lot of a Family Dollar store.
Gulfport Police Chief Adam Cooper said an officer engaged an armed suspect, since identified as McMillan, resulting in shots being fired. Police have not released the officer’s race.
McMillan’s family does not believe he was armed, and their supporters are calling for the release of CCTV footage of the shooting.
McMillan was initially taken to Memorial Hospital in Gulfport, but was transferred to the mobile hospital, where he subsequently died shortly before 8 p.m. 17 Saturday.
In a video taken by a bystander after the shots were fired, McMillan could be seen on the ground in front of the store’s door. A witness said police handcuffed the teenager after he was shot. Cooper said police took four other suspects, all believed to be juveniles, into custody and several firearms were recovered from the scene.
The Mississippi Bureau of Investigation is investigating the shooting of McMillan. The MBI investigates all police shootings in the state, and the attorney general’s office is responsible for any prosecutions.