Lady Margaret Road remained closed on Sunday (November 12) as Metropolitan Police Homicide and Major Crime Command officers comb the area for evidence.
Emergency services and armed police were called to scene at 1.23am on Saturday where a 26-year-old man was found with gun shot wounds.
He was rushed to a central London hospital from the scene by London Ambulance Service but died shortly afterwards at 3.32am.
A murder investigation was launched by Metropolitan Police on Saturday and the crime scene was scoured by police for evidence.
Officers from the Metropolitan Police Homicide and Major Crime Command are investigating and appealing for witnesses and those with information to come forward.
Detective Inspector Simon Stancombe said: "We are retaining an open mind as to the motive of this attack.
"We know that a large crowd gathered shortly after the shooting and some people within that group may well have witnessed what took place and seen the suspect(s) leaving the scene.
He added: "It’s vital they get in touch so we can build on the information we have and find those behind this shooting."
No arrests have yet been made and enquiries are ongoing.
Anyone who witnessed this incident or has information should call police at the incident room on 0208 358 0300 or via @MetCC. I nformation can also be reported anonymously to Crimestoppers on 0800 555 111 or online at www.crimestoppers-uk.org .
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