Police have launched a manhunt after a driver got out of his car and stabbed another driver to death after a crash in Findon, Sussex.
Sussex Police said it was looking for a man in a murder inquiry, after two vehicles collided on the A24 on Thursday evening.
It believes the suspect, who was driving the first car, got out after the crash and stabbed the driver of the other car, before fleeing in his own vehicle.
A 79-year-old man died at the scene after being stabbed opposite a garden centre at Rogers Farm, Findon.
The suspect is described as a skinny, tall, white man in his 30s. He is thought to have been driving the car in front of the victim before getting out and killing him.
A police statement said: "The air ambulance landed and paramedics carried out first aid on the man but he died at the roadside.The suspect is described as a white man, aged between 30 and 40, 6', skinny with shoulder length brown wavy hair with a thin face. His car is described as a pale coloured old style vehicle."
The man died just before 8.40pm last night, and police are appealing for witnesses to come forward.
A section of the A24 southbound at the junction of Cross Lane, Findon, is closed after the incident.
Detective Chief Inspector Karen Mizzi of the Surrey and Sussex Major Crime Team said: "Officers have been urgently making enquiries overnight to trace the suspect. We need to hear from witnesses who saw the collision, the suspect or the car involved, particularly if anyone filmed the incident or saw anyone filming it.
"Specially trained officers are supporting the victims family at this extremely difficult time."