Detectives are appealing for information after a woman was critically injured, and has subsequently died from her injuries in a collision in Chingford.
Police were called at 03:00hrs on Monday, 7 May, to a collision in Station Road, E4.
Officers attended the location and established that a car had been in collision with a female pedestrian.
The woman, aged in her 30's was taken to hospital by LAS.
She died on 8 May. Her next-of-kin are aware, although formal identification is yet to take place.
The driver of the car - a Ford Focus - stopped at the scene. The 23-year-old man was arrested on suspicion of causing serious injury by dangerous driving. He has since been released under investigation.
Anyone who witnessed the collision or has information that may assist police is asked to call officers at Chadwell Heath on 020 8597 4874.