Mujaahid Wilson, 20, was stabbed to death outside a pizza shop in
Thornton Heath on 14 March 2016.
Police and paramedics were called to reports of an assault on the High Street at around 8.30pm.
Mr Wilson, from Croydon, was pronounced dead at the scene and at postmortem the cause of death was established as a single stab wound to the heart.
Detectives said Mr Wilson was attacked after he got out of a Fiat Punto and approached one man in a group of nine or ten outside Mamma's Pizza.
A fight developed and spilled into the road and ended with the victim being stabbed. The suspect, described as black, aged around 18-25 and wearing dark clothing and a face mask, ran off into Gilsland Road.
On 7 June 2016 a 17 year-old man was charged with murder. He is due to stand trial at the Old Bailey on 5 December 2016.
Anyone with information is asked to call the incident room on 020 8721 4205 or if you wish to remain anonymous Crimestoppers on 0800 555 111.