- Two men arrested in connection with the incident have since been de-arrested and remain in hospital for treatment
The incident happened at about 3am on Saturday (June 10), when a car hit a building in West Cromwell Road.
The car was wedged between the side of the building and steps leading to a basement.
The London Ambulance Service and the London Fire Brigade (LFB) were called to the scene.
After the crash the knock-on effect led to long delays on the roads in West London and on the M4.
Two men were able to free themselves from the trapped vehicle and two other men were extracted from the car with the assistance of LFB.
All four - believed to be aged in their 20s - were taken to hospital, where one died later that morning.
A post-mortem examination and formal identification will be arranged in due course.
His next of kin have been informed.
A second man remains in hospital in a critical condition.
Two other men were arrested in connection with the incident. Neither suffered serious injuries. They have since been de-arrested and remain in hospital for treatment
As is routine in such cases, the Directorate of Professional Standards and the Independent Police Complaints Commission have been informed.
At this early stage it is understood that the car was seen by officers being driven at speed on Talgarth Road shortly before the collision.
Police say a squad car followed the vehicle and signalled for it to stop but it sped away out of sight of the officers.
When next seen by the officers, it had been involved in the collision in West Cromwell Road.
Enquires continue to establish the full circumstances.
Anyone who witnessed the collision, or the moments leading up to the incident, is asked to contact police via 101.
Keep up to date with the latest news in west London via the free getwestlondon app.
You can set up your app to see all the latest news and events from your area, plus receive push notifications for breaking news.