The New York City medical examiner says Friday that Simon died from blunt-force injuries to his head, torso and extremities and had fractures.
Police say Simon was not wearing a seatbelt Wednesday night when the car he was riding in collided with another vehicle on the West Side Highway in Manhattan. The law does not require livery car passengers to wear seatbelts.
Authorities tell CBS that Simon was thrown from the back seat to the front of the car.
His driver suffered leg and arm injuries. The other driver was uninjured.
Simon was among a handful of elite journalists to cover most major overseas conflicts and news stories since the late 1960s.