About 8.20am, a 72-year-old man was cycling west along Fishermans Road, when a white Holden Colorado collided with the rear of his bike.
The cyclist, who was not wearing a helmet at the time, was thrown from his bike.
St John Ambulance attended but the man died as a result of his injuries.
The 22-year-old female driver of the Colorado is helping police with their inquiries.
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They would like to speak to witnesses to the crash, or anyone saw the cyclist or the car prior.
Call Crime Stoppers on 1800 333 000 with information or make a report online at www.crimestopperswa.com. au.