Police are calling for witnesses to a motorcycle crash near Collie.
The crash happened at 11am on Sunday, April 13.
Senior Sergeant Mike Dean said were examining whether the 57 year old had a heart attack before driving into a barb wired fence on Hull Road near the intersection of Harris River road.
The RAC Rescue Helicopter was sent to the site and flew the man to Royal Perth Hospital.
A man has been airlifted to a Perth hospital following a motorcycle crash near Collie.
