Prominent WA toxicologist Peter Dingle says he blames himself for "stupid" decisions that ultimately led to his wife Penelope's death after she chose natural therapies to treat her colorectal cancer.
In an Australian Story to be aired on the ABC tonight and next week, Dr Dingle also accuses the State Coroner's Court of destroying his reputation and career after the "one-sided" evidence presented at the coronial inquest into his wife's death.
Mrs Dingle died in August 2005 after opting for alternative treatments, including natural therapy provided by homeopath Francine Scrayen, rather than surgery, chemotherapy and radiotherapy as recommended by doctors.
In the show, which interviews other family members as well as Dr Dingle, the former Murdoch University associate professor talks candidly about the treatment process.
He admits he has lingering regrets over his wife's death. "I was stupid," Dr Dingle says. "How could I do this? How could I go along with this craziness?
"I just remember . . . being in a state of absolute disbelief that I went along with this charade and that I was part of the charade.
"But you know what? Pen never blamed me for anything."
Last year's coronial inquest into Mrs Dingle's death found that Dr Dingle, who has no formal medical qualification, was actively involved in isolating his wife from the outside interferences of those recommending conventional medicine.
State Coroner Alastair Hope also found that homeopath Mrs Scrayen had persuaded Mrs Dingle that the treatment she was providing could cure her cancer.
But ultimately Mr Hope found that Mrs Dingle was responsible for her decisions.
In Mrs Dingle's diary, she describes an exclusive cult of three with the alternative practitioner (Mrs Scrayen) controlling every move and her husband set up as the gatekeeper.
"The sense was right from the very first phone call that you're either with us or you're against us," Mrs Dingle's sister Annie says in the ABC program.
Dr Dingle says the coronial inquest painted a false picture of Mrs Dingle's death.Mrs Scrayen did not take part in the show.
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