Police have renewed their appeal for information after a woman died following a single-vehicle crash at Ditchling Common, near Burgess Hill.
Emergency services were called to the B2112 Common Lane on Tuesday, June 4, where a blue Vauxhall Corsa had come off road and collided with a tree.
According to police, the car then overturned in a ditch near the Oaks Poultry farm.
The 26-year-old woman had been a rear-seat passenger among another woman and a man in the car.
All three casualties, who are from the Haywards Heath area, were taken to hospital with serious injuries.
The woman died in hospital on Tuesday, June 11, a week after the collision.
Police said the coroner was informed and they are appealing for witnesses.
Anyone with any information is asked to report it online or call 101, quoting Operation Alto.