Woman dies after Sydney road crash

A man accused of running down three pedestrians, killing one of them, will face court in Sydney next month.

A 21-year-old woman has died in hospital after being struck while crossing a Strathfield intersection with two men on Friday night.

She was initially taken to Westmead Hospital with critical head injuries but her life support was switched off on Sunday afternoon.

The men, aged 20 and 25, were taken to Royal Prince Alfred Hospital, one with a possible broken pelvis and the other with head injuries.

Police say the trio was crossing on a green pedestrian signal.

Officers are investigating whether the car was driven through a red light, Traffic Command's Acting Inspector Brett Samuel said.

The 37-year-old alleged driver, who was not injured in the crash, was initially charged with five offences including dangerous driving occasioning grievous bodily harm.

He has now also been charged with dangerous driving causing death.

The man's licence has been suspended and he is expected to face Penrith Local Court on February 25.