Police are investigating a fatal collision in Werribee on Monday, May 25.
It is believed a solo rider lost control and came off his motorcycle while travelling along Westleigh Drive about 11.30pm.
The 56-year-old rider from Werribee died at the scene.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or www.crimestoppersvic.com.au