Police were called to Garratt Lane at around 1.30am last Wednesday to reports a motorcycle and Honda Civic had collided.
A 25-year-old woman, who was a pillion passenger on the bike, died in hospital the next day.
The male rider of the motorcycle, aged in his 40s, was also taken to hospital.
The 22-year-old driver of the Honda Civic was arrested on suspicion of drug driving causing serious injury.
He has been bailed pending further enquiries to a date in March.
