A teenager who stabbed to death a clean-up campaigner with a samurai sword has been sentenced to life.

Robert Dunne, 31, was tackling two youths who were goading him in the street when he was stabbed in the back.

His attacker Jason Kelly, 19, of Outhwaite Street, Middlesbrough, pleaded guilty to murder.

He was sentenced to life with a recommendation that he serve a minimum eight years before being considered for parole.