Police are investigating after a 22-year-old woman was found with serious head injuries on a footpath in Grovedale on Monday, December 30.
The woman was discovered unresponsive on Birkenhead Drive around 1:45 pm.
Emergency services airlifted her to The Alfred Hospital, where she remains in critical condition.
At this stage, police do not consider the incident suspicious.
Authorities are urging anyone with information or relevant dashcam/CCTV footage to contact Crime Stoppers at 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au.