"We're fortunate that this second video was found and we were able to move swiftly to terminate a supervisor who lied and stepped outside of his training and state law".
The chief said he was disturbed by what he saw in the videos and by the actions of his officers.
McDonald was hired in August 2013. McDonald can be seen running over to the scene, and without stopping, viciously kicking Hollins' face.
Ayers said neither Bongiovanni nor McDonald had been in serious trouble with the department before Thursday.
One video showed one perspective of the Wednesday traffic stop in Gwinnett County. It proved crucial to the investigation and confirmed that the force used was unnecessary.
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In a Wednesday night Facebook post, Sir Maejor Page, the controversial president of Black Lives Matter of Greater Atlanta, called for "criminal charges (to be) brought against this officer expeditiously". The almost two-minute video, shot by a driver stopped a short distance behind the apparent traffic stop, appears to show one Gwinnett County officer pull a driver from his vehicle and struggle with him before placing him on the ground. Both officers then hold the man down before putting him in the backseat of their squad vehicle.
The department took swift action, firing the master police officer the very next day. According to the report, Hollins grabbed his phone and screamed "Help me" into it. Deon Washington said in a news release. As Hollins exits the vehicle with his hands up, the officer punches him in the face.
McDonald's firing came after a social media video showed him kicking and stomping Hollins while Hollins was on the ground after he left his vehicle.
Cain was charged with resisting arrest.
Police said 21-year-old Demetrius Bryan Hollins of Lawrenceville was pulled over for a broken tail light and resisted arrest, WSB-TV reported.
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According to Bongiovanni's report, the auto smelled of marijuana and Hollins "began to act unusual", saying he wanted to call his mother.
According to official report of what happened, released by Gwinnett Police, another officer, M. Bongiovanni, said he watched a vehicle fail to use a turn signal.
As the first officer observes, the second officer, seemingly unprovoked, stomps the handcuffed man in the face. That's when Bongiovanni requested a backup unit, according to the incident report.
In a second video, shot from a different angle by another witness, Bongiovanni can be seen approaching Hollins, who is still inside the auto.
"In my previous encounter he reached for a loaded firearm that was under his seat", he wrote in his report.
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Police then asked him to repeat what he just said.