Maina was on police bail when the Matalan store was targeted
A man convicted over the death of a Matalan store manager in east London was on police bail at the time of the killing.
Anthony Maina, 20, was found guilty of manslaughter after Jamie Simpson was stabbed during a failed robbery at the Hackney store in March 2008.
Maina, of Canning Town, was bailed after Rizwan Darbar, 17, was stabbed in West Ham during a mobile phone robbery.
He was later convicted of the 17-year-old's murder and jailed for life.
The Old Bailey jury which heard the Matalan case was not told Maina had been arrested shortly after Rizwan Darbar's murder in October 2007, but released on police bail due to lack of evidence.
In the ensuing 15 months Maina was involved in Mr Simpson's killing, was caught with a knife, cannabis, crack cocaine and heroin, before finally being charged in January last year with the 17-year-old's murder.
Maina was just 14 when he was convicted for the first time in June 2004 of battery.
Five months after the fatal attack on Rizwan in 2007 he acted as a look-out during the Matalan robbery during which Mr Simpson was stabbed in the neck.
Jamie Simpson was stabbed during a robbery on Easter weekend in 2008
In June 2008 he was fined for possession of crack cocaine and heroin, and a month later was given a community penalty for possession of cannabis and possessing a bladed article.
He was back in court in September and December 2008 for breaching the order and was charged with Rizwan's murder in January 2009.
Maina was jailed for life with a minimum term of 14 years for Rizwan's murder last August.
He will be sentenced on 22 March for Mr Simpson's manslaughter.
Kobina Essel, 19, from east London was found guilty of Mr Simpson's murder.
Simeon Jumah, Maina, and Randy Osei-Owusu, 17, who was named on Tuesday after the Judge Martin Stephens lifted reporting restrictions, were convicted of manslaughter.
The judge also lifted a reporting restriction on Maina's criminal history when prosecutors decided not to press for a retrial after jurors were unable to agree on a murder charge against Maina, Jumah, and Osei-Owusu.