The body of a man who was shot in the head lay in a communal garden for over 24 hours before it was discovered, police have revealed.
The 20-year-old was killed by a hooded man in a stairwell
Dipo Seweje, 20, of Orb Street, Walworth, south-east London, was found in the garden on the Aylesbury estate in Walworth, on Friday.
He is thought to have been shot at about 1600 GMT on Boxing Day while with a friend who ran off.
Police were investigating the shooting when the body was discovered.
The pair had become separated after being shot at by a man in a hooded top in a stairwell at the flats.
The friend returned home and in the early hours of 27 December he told police he had not seen Mr Seweje since the incident the previous day.
BBC correspondent Matt Prodger said some people in the community had expressed "disappointment" that it had taken police so long to find the body.
The murder is being investigated by officers from the Metropolitan Police's Operation Trident, set up to tackle crime in London's black communities.
Det Insp Andy Barton, who is leading the investigation, appealed for help from members of the public.
"At this early stage we need to establish what happened to the victim, who may have seen him and where did went before he was killed."
A man aged 18 was arrested at his home in Walworth in connection with the inquiry and released on police bail.