Police arrested three men after the unnamed victim was gunned down at 9:15pm.
Medics also rushed to the scene on St Joseph's Road – but the man was pronounced dead at 10:10pm.
Murder cops are now quizzing three suspects who were arrested nearby and a cordon remains in place tonight.
There were no other injuries reported.
It comes just a week after a teenager was stabbed to death in Eltham, South East London.
Jay Sewell, 18, became the 130th murder victim in London this year – a ten-year-high in the capital.
Charlie Dudley, 25, of no fixed address, has been charged with his murder.
Five males, aged between 16 and 22, and two women, aged 29 and 53, were released under investigation.
A 20-year-old man was bailed pending further enquiries as Homicide and Major Crime Command cops continue to investigate.
There have been 125 violent deaths in the capital so far this year – the largest number in a calendar year since 2009, when there were 129.
But tonight's fatal shooting has brought the number of murder investigations probed by the Metropolitan police to 131.
Of these, there have been 72 deaths involving a knife, 14 with a gun, one using both a knife and a gun and one involving a crossbow.
The shocking figures reveal just over a third of victims were aged 16 to 24 – with 25 aged 19 and under.
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