A 51-year-old motorcyclist died in a collision with a tree in Yerriyong on Saturday afternoon.
The man was riding his bike along Deans Gap Road, about 30km south of Nowra, when he lost control and hit the tree.
He was thrown from his bike and died at the scene.
Police were alerted to the incident and began inquiries.
They established a crime scene and will prepare a report for the coroner.
Police are yet to release the name of the dead man.