Hoping for help from the public in the hunt for a killer, the NYPD released a chilling surveillance video Monday that depicts a brutal murder on a Brooklyn sidewalk over the weekend.

It happened next to the Crown Fried Chicken at 2085 Nostrand Avenue around 7:40 p.m. Saturday. Surveillance footage shows 24-year-old Trevonne Winn leaning up against the wall of a Flatbush, Brooklyn, Baptist church when the gun-toting suspect exits a store wearing a grey or brown hoodie, dark pants, and possibly jeans. He turns on his victim and, without warning, opens fire.

Trevonne Winn was visiting the city from his home in South Carolina, staying with family in Brooklyn and working in Manhattan.

Tracey Winn, Trevonne Winn’s mother, flew to New York Monday morning from South Carolina. She told PIX 11 News, “”This was very senseless; he doesn’t know anyone here inNew York to be looked upon to be shot.””

When cops arrived they found Trevonne Winn shot in the torso. He was declared dead on arrival at King’s County Hospital.

Winn told PIX 11 News that she’d warned her son about visiting New York. She was fearful of the big city dangers but she never imagined she’d be here weeks later preparing her son’s funeral. “”We don’t know how we’re going get him back home, we need some kind of donation, anything that we can get to get him home and bury him safe.””

The victim’s cousin, Chanel Isaac, told PIX 11 News, “”It’s not right for him to just die like that. And he’s got two children, one child that’s one (year old), and his girlfriend is pregnant with the next one.””

The apparently random killing follows another shooting last week in the elevator of a Brownsville apartment complex, also caught on surveillance. Police are now looking for a suspect in that case — Djavan Perry, 20 — whose name was given to police by tipsters.

Police are still looking for the man who shot Winn, and are asking the public for help.