It happened near the Brook Street roundabout last night (credit: Google Maps)
The 43-year-old man is believed to have stepped onto the westbound carriageway near the Brook Street roundabout just before 9pm last night.
He started walking towards the central reservation when he was involved in a collision with a car.
Emergency services rushed there but the man was pronounced dead around 30 minutes later.
The driver of the car, a man aged in his 50s, stopped at the scene and was not arrested.
The road was closed in both directions but has since reopened.
Detectives from the Met’s Serious Collision Investigation Unit are appealing for any witnesses or those with dash cam footage to contact them on 020 8597 4874. Alternatively call 101 ref CAD 7572/14 July, or tweet @MetCC.
Tags: Havering, A12, Brook Street Roundabout