POLICE are investigating a motorcycle crash in which a man who was not wearing a helmet,was critically injured in Wanneroo on Friday.
The victim was riding a Suzuki motorcycle on Pinjar Road about 9.20pm on June 10.
Police Media spokeswoman Susan Usher said the rider lost control near the intersection of Wanneroo Road and fell from the vehicle after hitting a traffic island.
The man, in his late 30s, was treated in Royal Perth Hospital for head injuries. Police are calling for witnesses.