A driver who failed to stop for a marked police car on the A4095 in west Oxfordshire has died after his car ended up in a ditch.
The patrol car tried to stop the green Rover but it drove off towards Long Hanborough, near Witney.
Two officers followed but lost sight of the car before finding it in a ditch with the man trapped inside.
He died at the scene in the early hours. The Independent Police Complaints Commission is investigating.
The road was closed for more than six hours while the emergency services and collision investigators worked at the scene.
Thames Valley Police are now appealing for anyone who saw the Rover leave the road or witnessed the vehicles prior to the incident to contact them.