Police are investigating a fatal single-vehicle crash in Mornington this afternoon.
Emergency services were called to the Nepean Highway to reports a grey SUV crashed into a tree about 1.25pm.
The female driver, who is yet to be formally identified, sadly died at the scene.
Her male passenger was airlifted to hospital with serious injuries.
The exact circumstances surrounding the crash are yet to be determined and investigations are ongoing.
Anyone who witnessed the crash or has dashcam footage is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report via www.crimestoppersvic.com.au