A rapper was cleared of shooting two men dead at a Dizzee Rascal concert in Southall seven years ago.
Shakah Anderson, 28, had been accused of the murders of Mohamed Korneh and Selorn Gbesemete, both 21, at an anti-gun party in west London in 2002.
The original police investigation ran into a wall of silence after all of the 200 witnesses at the Tudor Rose nightclub in Southall refused to give evidence.
It was only reopened five years later in 2007 when the man, who cannot be named, approached officers from the Met's Operation Trident team.
The man named the gunmen as Anderson, a gangsta rapper known as 'Cash', and Wayne Freckleton, who was shot dead in a barbershop in April last year.
This week, an Old Bailey jury acquitted Shakah Anderson of both murder charges.
