Evidence was given that for much of the time, Hapuku had been focused on playing a PlayStation game.
Calling expert evidence to counter the claims, the defence contended the injury could have been inflicted earlier and argued the Crown had not excluded all other possibilities.
Dressed in black suit jacket and tie, as he was throughout the trial, which started on April 23, Hapuku bowed his head momentarily as the jury of seven men and five women delivered the verdict to Justice Forrest Miller.
As he was led out of the court, Hapuku shared the tears of his family, while others sat in silence, apparently stunned.
They'd been through two trials, the first ending with a jury unable to reach a decision last August.