A motorist who died after being struck by two cars in south-west London died of a head injury, a post-mortem examination has found.
The man, 40, was involved in a row with the driver of a Ford Fiesta shortly before the incident, police said.
The victim had been assaulted before the collision on Trinity Road, in Wandsworth, on Friday night.
The 25-year-old driver of the Ford, who was arrested on suspicion of assault, has been bailed to return in November.
Police are continuing to look for the two cars which failed to stop at the scene.
The victim, who was driving a Nissan Micra, and the driver of the Ford had pulled up at the junction of Trinity Road and Magdalen Road and left their cars before becoming involved in an argument, police said.
The 40-year-old was struck by the cars after the argument at about midnight on Friday. He died hours later in hospital.
Det Insp Justin Davies said: "Although it was late at night we know a number of vehicles drove past the incident and may have witnessed some part of the events.
"We also directly ask the drivers whose vehicles were in collision with the man to come forward and make themselves known."