Detectives are renewing appeals for information following a fatal stabbing in Fulham.
Police were called by the London Ambulance Service at 00:27hrs on Saturday, 16 March to Gowan Avenue, at the junction with Munster Road SW6, following reports of a fight in progress.
Officers and the London Ambulance Service attended.
A man was found suffering from stab wounds. He was initially tended to by members of the public. He received further treatment from medical professionals but despite their efforts, he was pronounced dead at the scene at 00:56hrs.
His next of kin have been informed and he has been formally identified as 29-year-old Nathaniel Armstrong from the local area.
Detective Chief Inspector Glen Lloyd, from the Homicide and Major Crime Command, said: "I am still eager to hear from anyone who was in the area of Gowan Avenue shortly after midnight on Saturday. Any information you have could be vital in establishing what happened that night.
"My team is particularly keen to trace a male who was seen near the scene at the time of the incident. He was described as a light-skinned black male, approximately 6ft tall with facial hair on his cheeks and a moustache. He was wearing a brown bomber style jacket and following the stabbing he left the scene in the direction of Fulham Road.
"Did you see him? Do you know who he is? Anyone with information on his identity or whereabouts is urged to contact police."
Enquiries including forensic analysis and the review of local CCTV footage at the time of the incident continue.
There have been no arrests.
Any witnesses, or anyone with information, is asked to call the police incident room on 0208 358 0100. To remain anonymous, call Crimestoppers on 0800 555 111. You can also tweet police via @MetCC
Young people who have information about violence or knife crime can visit the website Fearless where they can pass on information anonymously. Fearless is part of the Crimestoppers charity, and is also independent of the police.