Emergency services have responded to a fatal collision in Knoxfield overnight.
It's believed a teenage boy riding a bicycle was struck by a vehicle on Ferntree Gully Road just before 8.30pm.
The driver of the vehicle stopped at the scene and was not injured, nor was her passenger.
The 15-year-old Ferntree Gully boy was taken to hospital but has since died.
The female driver of the vehicle has been interviewed by police and released pending -further enquiries.
The exact circumstances surrounding the collision are yet to be determined and it will be investigated by Major Collision Investigation Unit detectives.
Anyone who witnessed the collision, with dashcam footage or information is urged to contact Crime Stoppers on 1800 333 000 or www.crimestoppersvic.com.au.
