Joseph Pritchard, 30, of North Babylon, died early Monday morning.
His pickup truck was stopped in the westbound lanes between exits 51 and 52 in the Dix Hills-East Half Hollow Hills area for an unknown reason when it was rear-ended by a commercial truck.
Both vehicles caught fire.
Authorities say Pritchard was pronounced dead at the scene. The driver of the truck suffered minor injuries. The other driver suffered minor injuries.