Police are trying to trace a group of men seen in the area
A £20,000 reward has been offered for information about the murder of an 18-year-old who was stabbed by a gang in west London nine years ago.
Jason Paul, from Southall, was stabbed repeatedly during the attack outside flats in Convent Way, Southall.
No-one has been charged over the murder. Police want to trace six to eight Asian men, then aged between 20 and 25, seen in the area on the day.
Mr Paul's sister and officers will hand out appeal leaflets at the scene later.
Seven men were arrested over the murder on 2 October 2000 but they were released with no further action taken.
Police were also unable to recover the murder weapon.
Det Ch Insp Lee Presland said: "Nine years have passed since Jason was murdered and his family is still desperate to know who killed him and see justice done.
"It may be that the circumstances of someone who was present at the murder, or knows who was involved, have changed over the last nine years and they may now feel that they can come forward."
Mr Paul's daughter was three months old at the time of his death.