Life sentence looms for Instagram killer

A 15 year-old boy with a history of violence is facing a life sentence for stabbing a pupil to death outside the school gates after an Instagram feud. The killer, who cannot be named because of his age, dressed in black before ambushing Quamari Serunkuma-Barnes, also 15, as the victim left the Capital City Academy in Willesden, northwest London. He chased Quamari in and out of traffic before stabbing him three times with a serrated military-style knife in front of…