Police want to make clear to the public, the person responsible and anyone else who knows or suspects who was involved, that the investigation is still very much active.
"The last year has not been easy for George's family and this week will no doubt be particularly difficult. He was a doting family man and the impact of his loss is never far from our minds; it drives us forward and makes us all the more determined.
"As the Taiaroa family has its own private reflection, we ask that the public also reflect on this case and contact us with any information they might have. It doesn't matter how much time has passed or how irrelevant it may seem, it may be important."
It has previously been reported in the media that the main suspect is Quinton Winders, who lives in Taranaki.
Anyone with information is asked to contact the investigation team on 0800 Kingswood (0800 546 479). Information can be also provided to the organisation Crimestoppers on 0800 555111.