Robin and Margaret Bain and three of their four children – Arawa, Laniet and Stephen – were killed in Dunedin in June 1994.
The only suspects were David Bain, the oldest son and only survivor, and Robin Bain, the father.
David Bain was charged with five counts of murder and in May 1995 convicted on each of the five counts and sentenced to mandatory life in prison with a minimum non-parole period of 16 years.
His case was taken up by Joe Karam and in 2007, the Privy Council in London, then the highest court to which New Zealanders had access, declared there had been a substantial miscarriage of justice.
Bain was released on bail in May 2007 and acquitted on all charges after a retrial in 2009.