Garbutt’s 40-year-old wife was found dead in the flat above the Post Office branch the couple ran in the North Yorkshire village of Melsonby in 2010.
She had been struck over the head with a metal bar.
Garbutt claimed he and his wife were the victims of an armed robbery, telling police a man forced him to open his Post Office safe at gunpoint and hand over £16,000 before he was able to run upstairs, where he discovered Diana’s body.
But at his trial, the prosecution said he had staged the robbery and had been stealing money from his branch.
Prosecutors said he then killed Diana, fearing his actions were going to be discovered.
Garbutt’s lawyers applied to the Criminal Cases Review Commission (CCRC) last year to have his case sent back to the Court of Appeal, with the commission still considering the application.
In a Guardian interview, external in 2024, Agnes Gaylor, Diana’s mother, said: “It’s obvious to anyone that Robin is taking advantage of the Horizon scandal to gain publicity. I don’t believe he’s going to get far with it.”
Her family was approached again earlier in October and did not wish to add any further comment.
