Since then, efforts to uncover what happened to the 47-year-old have proved fruitless, and police are now treating the investigation as a homicide.
Mr Hall's brother spoke out earlier this week, pleading for those responsible to hand themselves in.
Even if those directly responsible for Mr Hall's disappearance are unwilling to take this step, there must be others who know what have happened to him, and are willing to do so. A guilty conscience carries a heavy weight, and over time, it can only be hoped that weight becomes so overbearing that those who can solve this mystery do the right thing.
During the course of the investigation, it was suggested Mr Hall's background was less than pristine - he had served time in prison on drugs and weapons charges. But at this point, aside from suggesting lines of possible inquiry into his disappearance and presumed death, Mr Hall's background is largely irrelevant.
What matters is that he was a brother, a son, a father and a grandad. His family need closure, and they need it urgently. Any sudden, untimely death is obviously an awful experience for those left behind, but not knowing must surely be worse.
Whatever sort of a life Mr Hall lead, he deserves a proper farewell, and his family deserve to know what happened to him and to be allowed to grieve in peace.
Anyone with information relevant to the investigation should contact the investigation team on 0800 PITANGI, email Pitangi@police.govt.nz or text 0272 475 843. Alternatively, information can be provided anonymously via Crimestoppers on 0800 555 111.
Feedback: editor@wanganuichronicle.co.nz