The 20-year-old woman who died on Tuesday following a fall from a black BMW in New Addington has been named by The Metropolitan Police as Paula Newman.
The Beckenham resident was found unconscious on Tuesday, the day after she fell from the vehicle.
She was taken to Croydon University Hospital and was pronounced dead later that morning.
The results of a post-mortem examination identified her cause of death as head injuries. Police are treating the incident as suspicious.
On Tuesday police arrested a 33-year-old man, believed to be the driver of the car, who has been bailed until mid January pending further investigation.
Detectives believe Newman sustained the head injuries from the fall and are now urgently appealing for witnesses who were in the Dunsfold Way area of New Addington on Monday 11 November, between the hours of 20:45 and 23:30.
Detective Chief Inspector Diane Tudway, leading the investigation, said: “I believe Paula died as a result of the injuries sustained from falling from the car and that there may have been at least one other person in the BMW. I would urge that person, or anyone who witnessed the fall or has information that could help the enquiry to contact the incident room to help us piece together the events of that evening.”
Detectives can be contacted in the incident room on 020 8721 4005 or anonymously via Crimestoppers on 0800 555 111.