Shortly after the shooting Mr Taiaora's family made an impassioned television appeal and they said they could not understand why anyone would want to gun him down.
His daughter Rochai said her father did not have a bad bone in his body.
"Dad didn't like conflict, he didn't attract anger. I actually don't even remember my dad growling me, ever. He was the sort of guy that would stop strangers on the side of the road and start talking to them and be their friend for the rest of their life. And this is the absolutely confusing part of this. That's actually really the hardest part."
His wife Helen says there could be no reason for anyone to kill George.
"If they wanted to achieve destroying a family they've successfully done whatever was in their minds to do that."
Anyone with information is asked to contact the investigation team on 0800 Kingswood (0800 546 479) or Crimestoppers, anonymously, on 0800 555 111.