Major Crash Investigators are seeking witnesses to a fatal crash in Coolup on Sunday morning (June 18).
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.
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.