Rosie Mott meticulously planned the way she ended her life so her husband Evans wouldn't be held responsible.
After securing some equipment, assembling it and placing it in her room with her husband's help, she made sure Mott wasn't in the house when, after more than a year of talking about it, she finally took her life.
The plan, which Mott was fully aware of, included him making an electronic purchase out of their home to show he wasn't there when his wife ended her suffering from an aggressive form of multiple sclerosis.
Mrs Mott also made a video saying goodbye, and emphasising that she was taking her own life.
Mott, however, was completely honest when questioned by police, admitting he had helped his wife to a degree to take the path she had chosen, and his honesty led him to be charged with aiding and abetting his wife's suicide.
Details emerged in the High Court in Auckland on Thursday through lawyer Ron Mansfield, speaking at Mott's sentencing where Justice Patricia Courtney agreed Mott should be discharged without conviction.
Justice Courtney said Mott had played a lesser role in his wife's death than some who had been convicted for their part in the euthanising of others.
She said Mrs Mott would have ended her life even if her husband played no part.
She said Mott's career as a master boat-builder sometimes took him to the United States, where a conviction could cause him difficulty obtaining work, and in a struggling economy that could hinder his livelihood.
This meant Mott's "very particular" circumstances made a discharge appropriate, she said.
A tearful Mott said outside court that the decision "couldn't be a better legacy for Rosie".
Pro-euthanasia campaigner Rosie Kaplan was delighted Mott avoided conviction but says the law still needs to be changed.
Mott is now set to head offshore to take up a boat-building contract in Spain.