A jury in the High Court in Auckland has found a man guilty of the murder of a teenager in the Otara town centre in September 2006.
Jurors took less than an hour to reach their verdict on Tuesday.
Jeffrey Key, 26, was being retried for the killing of Riki Mafi, 17, in September 2006. Mr Malfi was beaten to death with a baseball bat.
Counties Manukau Detective Senior Sergeant David Pazzini, the officer in charge of the investigation, says police are making progress in their campaign against youth gang violence.