In the third video, the police officer can be seen stumbling backward as he fires shots and then falling. Police said that out of respect for the teen's family, he has been cropped out of the clip.

Belmar said the officer was assigned a body camera on Tuesday, but was not wearing it at the time of the shooting. Additionally, the vehicle's dashboard camera was likely not in use.

\"PHOTO:
David Carson/St. Louis Post-Dispatch/AP Photo
PHOTO: A police officer with a fire extinguisher stands in the broken out entry to a QuikTrip, Dec. 24, 2014, following a shooting nearby in Berkeley, Mo.
>

The officer -- a six-year veteran of the Berkeley police department, whose name will not be released until after the investigation but has been revealed as 34 years old and white -- fired three rounds, with one round striking the victim, Belmar said.

Belmar declined to release the victim’s name or race, but said the man’s criminal record includes assault and armed robbery charges.

Gov. Jay Nixon, who coordinated the state's response to the Ferguson protests, released a statement in support of the officer this morning.

\"The events in Berkeley are a reminder that law enforcement officers have a difficult, and often dangerous, job in protecting themselves and law-abiding citizens,\" he said in the statement.

Toni Martin identified the victim as her son, Antonio Martin. Toni Martin told reporters at the scene that her son was with his girlfriend at the time of the shooting and refuted police claims that her son was carrying a gun.

He was trying to get his life back on track after getting expelled from school, she said.

\"He was a good young man,\" she said.

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