Major Crash are investigating an accident that claimed the life of a motorcyclist in Marybrook on Monday, February 17.
About 2.30pm, a 60-year-old man was riding his blue Yamaha off-road motorcycle west on the dirt track alongside the Vasse-Yallingup Siding Road.
It is believed that the rider failed to negotiate a culvert that cut through the track and he crashed.
The man received critical injuries and was conveyed to the Busselton Health Campus where he later died.
Major Crash investigators have appealed for anyone who may have seen the crash, or the blue off-road Yamaha motorcycle travelling in the area prior to the crash to come forward.
In particular, investigators wish to speak to the rider of a green motorcycle who stopped to assist the 60-year-old man prior to emergency services arriving.
Police urge this person, and anyone with information regarding this crash, to contact Crime Stoppers on 1800 333 000.
Anyone who was in the area that has dash-cam vision of the motorcycle or the crash is asked to upload vision/photos to investigators via: https://wapf.au.evidence.com/axon/citizen/public/marybrookfatalcrash