Surveillance Footage Shows Texas 19-Year-Old Before Fatal Shooting

Arlington police officer Brad Miller was fired after allegedly fatally shooting Christian Taylor.
2:04 | 08/13/15

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Transcript for Surveillance Footage Shows Texas 19-Year-Old Before Fatal Shooting
We're going to turn now to new outrage this evening after a Texas police officer was fired for fatally shooting this high school football star. The surveillance footage showing the 19-year-old at a car dealership, authorities say acting erratically, damaging some of the cars. Police answering the call but it's what happened when they followed the suspect that wasn't captured on camera. Tonight that officer says the police chief acted too quickly in firing him. ABC's Ryan Owens in Texas. Reporter: From the moment Christian Taylor swings on the gate outside this Dallas area car dealership, his behavior is erratic. Surveillance cameras capture the 19-year-old trying to break car windows with his bare hands, jumping on cars, even driving his jeep through that same gate, slamming it into the showroom. The college athlete paid for his bizarre behavior that night, with his life. Shot and killed by 49-year-old Arlington Texas police officer brad miller moments after you see him walk into the dealership. I have decided to terminate officer miller's employment with the Arlington police department for exercising poor judgment. Reporter: The chief fired the rookie officer, who was still in training. The chief says the rookie violated department policy by going right into the building right after tailor without even telling his training officer. The chief says five other police officers were setting up a perimeter, making up a plan, but officer miller went in alone. Decisions were made that had catastrophic outcomes. Reporter: The chief says miller shot tailor four times. Several officers suspected Taylor had a gun in his pocket. It turned out to be nothing more than keys and a cell phone. Miller's attorney says the chief rushed to judgment to quiet protestors, and says the rookie made decisions in the heat of a violent confrontation to save his and other officers' lives. Because he's a rookie, miller cannot appeal his firing, but he might have a whole lot more to worry about than that tonight. He's now the subject of a criminal investigation that will end up before a grand jury. David? Ryan Owens tonight, Ryan, thanks.

This transcript has been automatically generated and may not be 100% accurate.

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