Police are investigating a fatal crash at St Marys last night.
Emergency services were called to Forrester Road, near Griffith Street, about 9.30pm on Monday, after a cyclist and an SUV collided.
The 19-year old male cyclist died at the scene.
The male driver was not injured but has been taken to hospital for mandatory tests.
Officers from Nepean Police District are investigating the circumstances surrounding the crash.
A report will be prepared for the Coroner.
Anyone with information about this incident is urged to contact Crime Stoppers on 1800 333 000.