A man is thought to have had a "medical episode" shortly before a fatal crash in Neasden.
Police were called to the A406 shortly after 12.30pm on Saturday, July 10 to reports of a multi-vehicle collision.
Officers attended along with paramedics from London Ambulance Service and London Fire Brigade.
Seven cars had been found to have been involved in a collision, and one driver was found in a life-threatening condition.
He was treated at the scene but died a short time later. His next of kin has been informed. He is believed to have suffered a medical episode a short time before the collision.
Another six people suffered minor injuries as a result of the collision.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here