On the night of Sunday, 13 October 1985, 61-year-old father of five Arthur Easton was stabbed to death in his Papakura home.
His sons, Brendan and Kim, were injured in the attack but survived.
The boys initially described their attacker as a strong six-foot Māori man. Police searched for this suspect for months but in the end, the man arrested, charged and incarcerated for Arthur's murder was Alan Hall - a slim five-foot-seven Pakeha with learning difficulties.
Alan has always maintained his innocence. More than 30 years later, he is still in prison.
In this extended interview, Mike Wesley-Smith speaks with Alan's brother Geoff about growing up in Papakura, Alan as a child, and how hearing the guilty verdict felt for the family.
Watch the video for the full extended interview.
See Mike's full TV exclusive on the Grove Road murder here.