A policeman who planted a shell casing to convict Arthur Allan Thomas of the murders of Jeanette and Harvey Crewe has died.
Retired detective chief inspector Bruce Hutton, 84, died at Middlemore Hospital on Sunday, reported the NZ Herald.
Hutton led the homicide inquiry into the killing of the Crewes at their Waikato home in 1970.
Thomas was found guilty of the murders at two trials before being pardoned in 1979.
He was wrongfully imprisoned for 10 years.
A 1980 Royal Commission of Inquiry found that a cartridge case from Thomas' rifle was planted at the murder scene by Hutton and one of his detectives, Len Johnston, but was unable to pin down the timing.
Even though a royal commission found police had framed Thomas by planting the cartridge case at the crime scene, no officer has ever been prosecuted.
Hutton is survived by his wife Ivy and children Gail, Christine and Erin.