(CNN)Chicago officers are seen firing at least 15 shots at a black Jaguar as it races down a tree-lined street. The car crashes. The driver bolts. Officers chase him down a driveway between brick houses and over wooden fences. Then multiple shots are heard."Get down! Hands behind your back! You shot at us, mother------!"
Moments later, officers curse at 18-year-old Paul O'Neal as they put him in handcuffs as he lies face down. Hands behind his back, his arms appear limp. The back of his shirt is covered in blood. An officer holds his foot on O'Neal's leg. Another holds down the mortally wounded man's head.
The actual shooting, which occurred on July 28, isn't seen in the footage because the officer's body camera didn't record the moment he opened fire. However, police say the officer who shot O'Neal in the back violated policy. The teen, police learned, was not armed.
O'Neal led police on a chase through the South Side of Chicago. He had been suspected of stealing a car. The officer who fired the fatal shot was in a car that crashed with the Jaguar that O'Neal was driving.
Whether the crash had an impact on the camera's ability to record is under investigation, according to police. Investigators are also looking into whether the officer had turned it on.
Oppenheimer said the officer's body cam could have been shut off or manipulated.
"It is unbelievable to think that this new technology ... simply didn't work," he said.