The man has been identified as 34-year-old Troy Ramsundar.
Police were called at 5.10am on Thursday (March 20) to Troy with a stab injury in Brixton Road.
Officers and London Ambulance Service attended but he died at the scene.
Troy’s family continue to be supported by specialist officers.
A man arrested at the scene was later released with no further action in relation to the murder.
Police are now appealing for anyone with information to come forward, particularly those who were in the area between 4.45am and 6am.
Detective Chief Inspector Brian Howie, from the Met’s Specialist Crime Command and leading the investigation, said: “My thoughts are with the victim’s family and friends at this devastating time.
“I understand the shock and concern this incident will have on the Brixton community.
“My team are already working diligently to gather evidence and establish what led to this tragedy.
“I would ask any local residents with concerns to speak to officers at the scene, or to their local neighbourhood policing teams.
“If you have any information that could assist this investigation, I urge you to get in contact immediately.
“I am particularly keen to speak to anyone who was in the area between 4.45am and 6am and may have seen something.”
Anyone with information is asked to submit this online via the Major Incident Public Portal (MIPP).
Alternatively, you can call 101 or ‘X’ @MetCC and quote CAD843/20Mar.
You can also provide information anonymously to the independent charity Crimestoppers on 0800 555 111.
