Police Capt. Elvio Capocci made a plea for witnesses to come forward in the Sunday night.
He made the plea at a tonight.
"It was a 20-year-old kid. From what I understand he was a good kid. I hear he was in church yesterday," Capocci said.
So far police have not been able to find a single witnesses who will speak to them, Capocci said.
There has not even been a single annonymous tip, he added.
Police have not released the name of the victim yet.
"All good police work usually starts with a tip. We're waiting for that tip and hopefully we'll get it," he said.
The 20-year-old man was shot in the lobby of the 709 Sterling Place, a three-story apartment building, Capocci said. He did not live in that building, Capocci said.
"The shooters were outside, the poor kid was inside. It (the shots) might have gone through the door," he said.
"We don't know exactly what happened just yet," he added.
The man was pronounced dead at Kings County Medical Center soon after.
"It was a busy street busy part of the neighborhood," Capocci said. But when police arrive at a scene, people scatter, and no one's seen a thing, he said.
People who might have information on the case should call the 77th Precinct at (718) 735-0611.