The cousin of one of the men convicted of killing City lawyer Tom ap Rhys Pryce has been found guilty of murder.
Lloywen will be sentenced on Wednesday
Lloywen Carty, 26, was found guilty of being part of a gang who shot dead Lee Subaran, 27, in August 2004.
Last month, his cousin Donnel Carty, 19, was given a life sentence for killing Mr ap Rhys Pryce, 31, in Kensal Green, north-west London, in January.
Unemployed Lloywen denied killing Mr Subaran at a party attended in Kensal Green after the Notting Hill Carnival.
Mr Subaran and his brother Tyrone were surrounded by about a dozen members of the drug-dealing Mus Luv Crew gang, the court heard.
The victim, from Mill Hill, north London, was shot at point blank range in the neck and chest after being accused of showing disrespect to Leon Roberts.
Detectives believe up to six guns were drawn during the incident and bullets were fired from at least three, including a MAC 10 machine gun.
Also found guilty of murder were Conroy Smith, 29, a kitchen assistant of Harlesden, north London, and Jermaine Labastide, 28, a music promoter, of Kennington, south London. They will be sentenced on Wednesday.
The trial follows an earlier court case last year in which other gang members, Leon Roberts, Tafari Dacas and Shane Taylor, were convicted and jailed for life.
Lee Subaran was shot at point blank range
The Cartys were both living with their grandfather in Burrows Road, Kensal Green, north London, in January when Mr ap Rhys Pryce, 31, was stabbed by Donnel and Delano Brown, 18. Brown and Carty were given life sentences, with a minimum jail term of 21 years.
Both cases were heard at the Old Bailey but Donnel's trial, which started a few days after Lloywen's, was moved to another floor after the coincidence came to light.
The judges in both cases made contempt of court orders banning reporting of the cases together.
Jurors were also shielded from the knowledge there were two murder suspects in one family, by Donnel's case not being listed or called.
Outside court, Det Insp Steve Horsley speaking about the Subaran murder, said: "For over two years, my team has relentlessly pursued the gang responsible.
"The convictions have taken some very dangerous armed criminals off the streets."