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A murder investigation is underway after a man stabbed in Brixton died in hospital on Thursday, 27 February.
On Tuesday, 25, February police were called by London Ambulance Service (LAS) at around 17:00hrs to a man in his stabbed in the chest in St John's Crescent, SW9.
The victim, aged 20, was taken by LAS to a south London hospital in a critical condition. He was later pronounced dead on Thursday evening, 27 February. Next of kin are aware.
He was Dwayne Simpson, 20 (17.07.93) from Stockwell.
Detectives from the Homicide and Major Crime Command are now investigating and an incident room has opened.
A post mortem examination will be arranged in due course.
An incident room has opened under Detective Chief Inspector Cliff Lyons of the Homicide and Major Crime Command.
Three male youths all aged 16 were arrested on Tuesday, 25 February - two on suspicion of GBH [A/C], one on suspicion of attempted murder [B]. They were taken to a south London police station and later bailed to return on a date May pending further enquiries.
On Wednesday, 26 February officers arrested an 18-year-old woman [D] on suspicion of attempted murder. She was taken into custody at a south London police station and later bailed to return on a date in May pending further enquiries.
It is believed the stabbing took place on Rossiter Grove, SW9.
Detectives are appealing witnesses and information and urging anyone who hasn't already been spoken to by police to contact them.
Anyone who can assist police are asked to call the incident room on 020 8721 4961 or call Crimestoppers anonymously on 0800 555 111.