Sadiq Adebiyi, 25, was killed in a drive-by shooting near Stockwell tube station in south London on May 31, 2011.
He was standing on the pavement outside Richardson Court on Clapham Road at around 11.30pm when two men on a Triumph motorcycle opened fire wtih Mac 10 submachine gun.
Mr Adebiyi, from the Stockwell Gardens Estate, was and died in hospital an hour later.
The killers, wearing dark clothing and helmets, drove off in the direction of the Patmore Estate chased by two police officers who happened to be driving past in a marked patrol car.
Detectives believe Mr Adebiyi was shot because he was thought to be a member of the ABM 'All Bout Money' gang from the Stockwell Gardens Estate.
The ABM had been involved in a feud with the rival 'O-Trey' gang from the Patmore Estate.
Jordan Burree, 24, [19/04/87], of Down St, West Molesley, Surrey, was charged with murder and went on trial at the Old Bailey on November 29, 2011. The prosecution said Burree was one of the men on the bike and was caught on CCTV taking off his balaclava and helmet after the shooting.
The motorcycle was then given to Tadzingwa Gambiza, 19, of Broadfield House, Stockwell, to get rid of but he was spotted by officers and crashed.
On December 15, 2011, Burree, then aged 25, was convicted of murder. He was later jailed for life with a minimum of 33 years. Tadzingwa Gambiza was convicted of perverting the course of justice and jailed for 15 months.
Detective Chief Inspector Neil Hutchison from Trident, said: “Sadiq Adebiyi was shot down in cold blood on a busy street. He appears to have been targeted as a possible member of a rival gang rather than because he was personally known to his murderers."
“This highlights the danger this kind of mindless gang conflict poses to young people in some areas of London. I would like to acknowledge the bravery shown by those unarmed officers who chased the suspects from the scene of the murder and arrested Mr Gambiza."
“Unfortunately we have not been able to charge the other male that carried out this murder or recover the machine gun used. A number of people witnessed some of the events that night but have been unwilling to help us. I appeal to them to reconsider their position.
"Trident works with our colleagues in the criminal justice system to ensure that witnesses are protected before, during and after criminal trials. This investigation is not over and with those witnesses help we could convict the other person who carried out this murder. I would also like to offer my condolences to the family of Sadiq Adebiyi."
In April 2007 Jordan Burree, then aged 20, stood trial with two other men for the murder of Fabian Ricketts but was acquitted. He was jailed for three years after being caught with an 120 year-old Smith and Wesson revolver.
Mr Ricketts, an 18 year-old aspiring film director, was shot dead outside the Battersea Bar in York Road, Battersea, on April 17, 2006.