The deceased had received a single 13cm deep wound piercing the heart.
Davies denied a charge of murder and at the trial before Justice Christine Grice was found not guilty, but guilty of manslaughter.
On Thursday the Judge agreed with Crown and bereaved whanau assertions of a lack of remorse but took into account that Davies had at an early stage indicated he would plead guilty to manslaughter if the prosecution did not proceed with the murder charge.
Davies gave evidence at the trial at which the deceased's partner said she was inside at the time of the incident, which happened as Mr Wirihana-Hawkins argued in response to an accusation that he had taken Davies' son's tobacco.
Holding a photo of him as she gave evidence she told of hearing him cry out "Babe. Babe", and going outside where she saw him take his last breath.