Detectives appealed for witnesses after a minicab driver was found dying in the street, Scotland Yard said.
Officers were called to Abbey Wood, south London, just before 5am on Saturday and found 49-year-old Michael Okonko-Nwoso with head injuries.
Mr Okonko-Nwoso, who was married with children, was taken to the Royal London Hospital where he died the same day.
Det Ch Insp Dave Manning said Mr Okonko-Nwoso was a licensed minicab driver for a firm based in south-east London.
He said: "He was a law-abiding hard working family man who has been brutally murdered in the street whilst carrying out his everyday business.
"It is essential that anyone who may have seen or heard anything suspicious in the area around that time on Saturday morning does come forward.
"We must keep an open mind regarding any motive at this early stage."
Mr Okonko-Nwoso was found collapsed behind his minicab, a silver Ford Galaxy, with its doors open but nothing was stolen.
Two men, aged 27 and 28, were arrested the same day and later bailed.
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