UPDATE:

A 25-year-old woman found lying unconscious with severe head injuries on a Port Douglas street on January 1 remains in a coma in Townsville hospital while investigations into her case continue.

Detective Sergeant Trevor Perham of the Mossman Criminal Investigation Branch said staff at Townsville Hospital were keeping the woman in a medically-induced coma and would were not likely to change that situation for at least a week. 

"Investigations into this incident are still ongoing," Dt Sgt Perham said. 

"Right now we are still searching for witnesses and we ask anyone with information to come forward."

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Police are appealing for witnesses after a 25-year old Port Douglas woman was found lying unconscious with severe head injuries on St Crispin's Avenue just before midnight on January 1. 

It is believed the woman was travelling as the passenger of a blue Holden Frontera seen travelling along Port Douglas Road shortly before she was found.

The woman was airlifted to Townsville Hospital, where she remains in a critical but stable condition. 

Police have spoken to the driver of the blue Frontera, who is known to the victim.