Joshua Molnar fatally stabbed Yousef Makki with a flick knife on March 2, 2019.
Yousef, 17, was stabbed during a row in Hale Barns, Greater Manchester. Molnar, who was also 17 at the time, was cleared of manslaughter and murder and an inquest later recorded a narrative conclusion.
He claimed self-defence and was cleared by a jury at Manchester Crown Court. Molnar was later jailed for possession of a knife in a public place and perverting the course of justice by lying to police at the scene.