A 41-year-old local man, believed to be the driver of the car, was arrested for grievous bodily harm at the time.
This is now being treated as a homicide investigation by Surrey and Sussex Major Crime Team working in conjunction with colleagues in West Sussex Division.
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Amanda Houston has the latest weather forecast for the west of the Meridian region.
Amanda Houston has the latest weather forecast for the east of the Meridian region.
Police wanted to question Norman Williams over the suspected murders of his sister-in-law Sheila Jefferson and her husband Dennis.