22-year old Colin Garrett was driving on the highway's northbound service road in Patchogue early Sunday morning when the vehicle went out of control, hit a fence and grass median, and overturned on the highway.
Garrett, a resident of Patchogue, was thrown from the car and killed.
Two passengers, 22-year old Colleen Malia of Oakdale, and 20-year old Nicole Wilk of Bohemia, were taken to Brookhaven Memorial Hospital Medical Center.
They are being treated for non life-threatening injuries.
The vehicle was impounded by Suffolk County Police for safety checks and the investigation is continuing.