A long-serving police constable who was critically injured as he tried to stop a speeding car has died in hospital.
Pc Andrew Duncan, 47, was pronounced dead in hospital on Sunday morning following the collision in Sutton, south London, in the early hours of Friday.
The married father-of-two suffered severe injuries following the hit-and-run, which involved a black Volkswagen Golf.
Metropolitan Police Commissioner Sir Bernard Hogan-Howe said: "Andy was a hard working and courageous policeman. He served the community as both a police officer and as a Scouting volunteer.
"The night he was injured, he was doing a job that he loved and we all had every right to expect he would return safely to his home and family - tragically that was not the case."