Nassau County detectives say 23-year-old Jovany Huddleston used a pocketknife to stab and kill 19-year old Bryant Nunez of Brentwood.
Investigators say the two men got into a fight inside the Shy Lounge on Hempstead Turnpike at 3:30 Saturday morning.
Bouncers threw the men out of the club, but the fight continued in the parking lot.
That's when police say Huddleston stabbed the victim in the abdomen. Nunez died several hours later at the hospital.
A second man, 18-year-old Ranier Ramirez of Brentwood, was also stabbed in the neck. He was treated and released.
Police did not say what caused the fight. Huddleston was scheduled to be arraigned on Sunday in Hempstead.