Officers from the Serious Collisions Investigation Unit continue to appeal for witnesses following a fatal collision in Isleworth.
Police were called to Twickenham Road, TW7 at approximately 13:15hrs on Thursday, 26 April to reports of a road traffic collision between a Toyota Yaris and a moped.
The 18-year-old rider was treated by the London Ambulance Service but died at the scene at 13:59hrs.
He has been named as Sam Jefferies, who was 18 and from Chiswick.
His next of kin have been informed.
A post-mortem examination will be scheduled in due course.
The driver of the Toyota stopped at the scene.
Officers from the Roads and Transport Policing Command are investigating.
Any witnesses or anyone with any information is asked to contact detectives at the SCIU on 020 8543 5157 or via Twitter @MetCC quoting CAD 3763/26Apr
There have been no arrests and enquiries continue.