According to authorities, the shooting happened at All Friends Deli located at Gates and Onderdonk Avenues in Ridgewood at about 6 p.m.
The victim has been identified as 26-year-old cousin Ishak Ghali. Cops say he suffered a gunshot wound to the head and it appears it was the result of a botched robbery.
Ghali was reportedly in the middle of a 12-hour shift at the shop when he came face to face with the gunman.
No arrests have been made and police are still investigating.