Teen Killed in Police Shooting in South Carolina

Authorities reveal no criminal charges will be filed against the officer.
1:33 | 10/27/15

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Transcript for Teen Killed in Police Shooting in South Carolina
And to another breaking headline late today. Word there will be no state criminal charges after an unarmed teenager on a first date was shot and killed by a police officer. This is the teenager, his family outraged tonight. And for the first time, authorities have now released the video from that fast food parking lot. You can see the images, the moments right before the officer opens fire. Investigators revealing what they believe happened and why they believe the shooting was just justified. ABC's senior justice correspondent Pierre Thomas tonight. Reporter: The young couple was sitting in the car after buying ice cream on a first date. It all goes down in seconds, following a sting in which undercover police allegedly sell drugs to a woman riding in this car with 19-year-old Zachary Hammond. Seneca, South Carolina, officer mark tiller, with his handgun drawn, tries to make an arrest, briefly stepping in front of Hammond's car. But Hammond attempts to speed off. Officer tiller fires. Hammond, struck twice in the side and back, dies. Today, a South Carolina prosecutor concluded the shooting was justified, that officer tiller had reason to fear for his life and that he had a difficult decision in to make in just three seconds. But tonight a justice department investigation continues, and federal charges could still be brought. Hammond's parents say he was shot after his car had passed the officer. They are suing, claiming the officer's life was not truly in danger. David? And Pierre, what about the young woman in the car? The boy's date? Reporter: David, she was charged with marijuana possession, but remarkably, she was not hurt. Pierre Thomas live in your Washington bureau tonight. Pierre, thank you.

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

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