Police said the victim, identified as Aaron Thomas of Amityville, had run out of gas on the Expressway westbound in Commack. He left his vehicle parked on a safety zone between the express zone and the entrance ramp, and went to purchase gas on Commack Road.
Thomas was returning with the gas at about 8 p.m. when he was struck at the entrance ramp by a vehicle entering the Expressway, police said.
Thomas was transported to Huntington Hospital where he was pronounced dead.
The driver stayed on the scene and her vehicle was impounded for a safety check, police said. Investigation is continuing.