Kent Police have said the pedestrian was pronounced dead at the scene. The clockwise carriageway of the M25 between junctions 3 and 4 is likely to remain closed until around 11am.
Any witnesses or anyone with information are asked to contact Kent Police on 01622 798538.
More top news
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.
The attacker grabbed her dog lead wrapped it round her neck and started to strangle her before running away.