Officers were called at 9.41p on Thursday, 10 September to reports of a collision involving a car and a motorcyclist at Gallows Corner.
The motorcyclist, a 53-year-old man from Essex, died at the scene. His next of kin have been informed and are being supported by specialist officers.
A 24-year-old man was arrested on suspicion of causing death by dangerous driving. He remains in custody.
Officers from the Met’s Serious Collision Investigation Unit want to hear from anyone who witnessed the collision, or the moments before.
Anyone with information is asked to call police on 101, quoting CAD 7670/10Sep.