A 36-year-old man from Hungerford in Berkshire has died after a collision on the A34 in Botley, on the outskirts of Oxford.
Thames Valley Police said the incident happened at around 2.15am. A silver saloon car travelling southwards on the A34, about half a mile before the Botley Interchange, collided with a man who was walking in the carriageway.
The 36-year-old pedestrian died at the scene. His next of kin have been informed, and are being supported by specially trained police officers.
A 73-year-old man from Faringdon in Oxfordshire has been arrested on suspicion of causing death by dangerous driving, driving whilst unfit through drink and failing to stop after a road accident.
Thames Valley Police are asking anyone who has information to get in touch by calling the telephone number 101, quoting URN 146 (16/12).