Police are investigating a fatal collision in Grangefields last night.
It is understood two motorcycles and two vehicles collided on the Western Freeway about 11.20pm on 5 July.
One of the riders, who is yet-to-be-formally identified, died at the scene.
The other motorbike rider was transported to hospital with life-threatening-injuries.
The drivers of the vehicles stopped at the scene and were uninjured.
Police are working to establish the circumstances surrounding the collision.
Major Collision Investigation Unit detectives were deployed to the scene.
Anyone who witnessed the incident, has dashcam footage or any other information that could assist police is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au
