The footage released by Mississippi authorities on Thursday shows a first-person perspective of the officer who opened fire.
After being told by a staff member that suspected shoplifters were getting away, five law enforcement officers run towards the car with guns drawn.
The vehicle reverses, crashing into a parked car, before pulling forwards.
The officer wearing the body camera raises his gun and aims it at the moving vehicle as he runs closer, shouting: “Stop!”
As the car closely passes the officer, he fires his gun, shattering the passenger-side window.
Four gunshots can be heard, as police command the driver to stop. The car continues to drive off slowly through the car park.
CCTV video from the storefront appears to show that at the moment the policeman opens fire, another officer is standing near the front of the moving vehicle.
“We are very sad for the loss of life,” Zummach said. “But the outcome of the investigation was not only expected, but it was overdue.”
The child’s mother, Wiley, has denied she and her friend stole nappies from the store. No charges have been filed against them.
The boy’s death has sparked protests and vigils in Mississippi.
At a news conference, relatives demanded accountability.
“After what I’ve seen today, I’m having a difficult time understanding the word, ‘justified,’ said LaSandra Williams, Kohen Wiley’s grandmother.