The 43-year-old man has now had criminal charges upgraded to include manslaughter and two dangerous driving offences.
Emergency services found the 40-year-old woman critically-injured in Peppin Crescent in Airds on Thursday afternoon.
She was rushed to Liverpool Hospital while police established a crime scene and launched an investigation.
The man was taken to hospital for mandatory testing.
He was then taken to Campbelltown Police Station, where he was charged with dangerous driving occasioning grievous bodily harm.
He was refused bail and appeared in Campbelltown Local Court on Friday.
Investigators were told the woman died in hospital on Saturday.
As a result, police upgraded the man’s charges to manslaughter, dangerous driving occasioning death, and dangerous driving occasioning grievous bodily harm.
Police said they will allege in court the woman was injured after falling from the bonnet of a car being driven by the man.
He is due to appear before Campbelltown Local Court on Tuesday.
