The video out Thursday morning came from the surveillance cameras on the outside of the Ya Ya Deli at Saratoga Avenue and Prospect Place.
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It shows the gunman walking out of the deli before he reaches into his waistband, pulls out a gun, and pulls the trigger.
It happened Wednesday just before 5 p.m. after police say a group of teens, possibly part of some juvenile robbery gang, had an argument outside the store.
That dispute ended with 17-year-old Graig Bassett being shot in the torso.
He died at Interfaith Medical Center.
A small memorial now sits at the corner outside the deli where Bassett died. He lived just down the block from the deli.
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"Lighting a candle for our friend, sad we lost our friend, but it's another day for us," the victim's friend said.
Teenagers have been traumatized by the violence they've grown up in.
"Like you never know when it's going to be your last day," said Olivia Doughty, a neighbor. "That's really young and I feel bad for the parents and what they're going through right now."
Eyewitness News also spoke with a man who works inside the store.
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"It's sad to see somebody lose their life over what, money, women? What could be the problem to take somebody's life? It's very sad, I'm speechless," said Mohamed Alzindani, a deli worker.
If you can help investigators make an arrest, call the anonymous Crime Stoppers tip line at 1-800-577-TIPS.
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