The woman's identity has not been released.
Police said the accident occurred at 9:29 p.m. near the intersection of Greene Avenue.
Police said the woman was walking north and was struck by a 2006 Hyundai driven by Jesse McNamara, 18, of Lindenhurst.
Police said McNamara told them he never saw the woman.
The woman was pronounced dead at the scene, police said.
The Hyundai was impounded for a safety check.
Police are asking anyone with information to contact the First Squad at 631-854-8152.
All calls will remain confidential, police said.