A 19-year-old man from the Stockton area has died after an accident involving a lorry on the A689 this morning.
It happened at 7:50am between the A177 Stockton Road and Sands Hall Roundabout.
Police are appealing for witnesses and anyone with information on a broken down Peugeot 406 seen on the same stretch of road before the accident.
Anyone with information can contact Durham Police by phoning 101.
The road is closed in both directions and is affecting traffic from the A1(M) at Bradbury and through Sedgefield.