A 15-year-old has been convicted of murdering software engineer Ian Kirwan, who was stabbed in the chest after a row at an Asda in Redditch.
Three other youths – two aged 14 and one aged 16 – were cleared of murder and manslaughter but jurors found them guilty of violent disorder.
A fifth boy, aged 16, was acquitted of murder, manslaughter and violent disorder, having claimed he was not involved in the fatal confrontation and could not have predicted it.