He was also charged with wounding with intent to cause grievous bodily harm on a 17-year-old, who remains in hospital.
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Jamie Lee Burbank, 22, of Chaucer Street, Nottingham was found guilty of wounding with intent to do grievous bodily harm on Wednesday.
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Mr McDonald, of Hartington Road, Lozells, Birmingham, also faces a charge of wounding with intent following injuries to a second shopkeeper, Mohammed Jahingir.
Sasha Masamba, of Nicholes Road, Hounslow, had pleaded guilty at the Old Bailey to two offences of wounding with intent to cause grievous bodily harm.
The suspects are being held on suspicion of wounding with intent.
Five of the men charged with the offences relating to Mr Barrett's death were also charged with wounding with intent over a related attack on his uncle, Patrick Barrett.
Brett James, jailed for two years for unlawful wounding with intent, had previous convictions for battery, common assault, affray, disorderly behaviour, racially abusive behaviour and assault occasioning actual bodily harm.
She is serving a five-year sentence for wounding with intent and was refused a place at Holloway's mother-and-baby unit by prison governor Mike Sheldrick on grounds of alleged violence and unpredictable behaviour.
Lance Forrester, 26, of Great Western Street in Moss Side and Jermaine Wilson, 22, of Spindle Avenue in Blackley were found guilty of wounding with intent and admitted violent disorder at an earlier hearing.
Lathan Forrester, 23, of Great Western Street in Moss Side and Ashaun Townsend, 19, of Woodstock Road in Moston were found guilty of wounding with intent and attempting to wound with intent and admitted violent disorder at an earlier hearing.
Tremaine Lee, 19, of Yeovil Street in Moss Side, Derico Smith, 20, of Brentnor Road in New Moston and Kamar Anderson, 26, of Hayfield Close in West Gorton were found guilty of violent disorder, wounding with intent and attempting to wound with intent.
He admitted wounding, possessing a firearm with intent to endanger life and dangerous driving at Liverpool Crown Court.
Martin was also convicted of wounding a second burglar, Brendan Fearon, 30, also of Newark, with intent to cause grievous bodily harm.
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