Major Collision Investigation Unit detectives are investigating after a pedestrian was struck by a car in Narre Warren South on 13 February.
Emergency services were called to reports a Toyota C-HR station wagon was travelling along Pound Road when it left the road and hit a 16-year-old boy before crashing into a tree about 4.30pm.
The Narre Warren South teen was airlifted to hospital however died on 20 February.
The female driver, a 48-year-old Narre Warren South woman, was taken to hospital with minor injuries.
Investigators are still establishing the exact circumstances surrounding the collision.
Anyone who witnessed the collision, has dashcam/CCTV footage or information is urged to contact Crime Stoppers on 1800 333 000 or submit an online confidential report at www.crimestoppersvic.com.au.