The 62-year-old from Medowie was riding along Cabbage Tree Road at about 6.15pm on Wednesday when his motorbike collided with a utility.
The motorcycle then careered into an adjacent fence causing fatal injuries to the man.
The 24-year-old Williamtown man driving the utility was taken to the John Hunter Hospital for routine blood alcohol tests.
Anyone who can assist police with their inquiries is urged to contact Crime Stoppers on 1800 333 000.
