A 37-year-old male driver from Bognor Regis was taken to hospital on Saturday, March 10, with serious injuries.
He was driving a blue Volvo S60 car which was in collision with a motorcyclist on the A285 at Petworth.
The motorbike rider - a man from Liss in Hampshire aged 41 - died at the scene in spite of the efforts of the emergency services.
He was riding a red Yamaha R1 when the crash occurred around 4.45pm on Saturday at the road’s junction with Haslingbourne Lane.
Anyone with information about the accident has been asked to contact Sussex Police on 101 quoting Operation Columbia.