UPDATE: The man hit by a van in Kanwal on Sunday night has passed away in John Hunter Hospital.
The 23 year old was hit on Wallarah road around 11:30pm, after reportedly being involved in an altercation with four other people.
Police say they've spoken to several people as part of their investigations, and we may know more later today.
While Police are reviewing CCTV footage of the moments just before the incident.
MONDAY: Police believe a man hit by a van in Kanwal was involved in an altercation with other people moments before the collision.
They're following up leads the 23-year-old was with four other people on Wallarah Road, before running across the road and being struck by an eastbound van around 11:30pm.
As a result of the impact the man was thrown into the westbound lanes where he was assisted by passers-by.
He was taken to John Hunter Hospital where he is in a critical condition undergoing surgery for head injuries, a broken leg and abdominal pain.
While the 28-year-old man who was driving the van was taken to Wyong Hospital for mandatory blood and urine testing.
Tuggerah Lakes Police are investigating the incident and are appealing for witnesses.