The husband of a woman who killed herself in 2014 has been found guilty of aiding her suicide, with the court hearing he stood to gain $1.4 million from her life insurance.

A jury found Graham Robert Morant, 69, aided his wife Jennifer Morant, 56, to gas herself in her car by helping her buy equipment from a hardware store.

He was also found guilty of a second charge of counselling his wife to suicide.

Mrs Morant — who the court heard suffered from chronic back pain, depression and anxiety — was found by police dead in the driver's seat of her car on November 30, 2014 with the doors closed and a note saying "please don't resuscitate me".

The trial in the Queensland Supreme Court in Brisbane heard Morant stood to gain $1.4 million from three life insurance policies, that would be paid out even in the event of a suicide.

He always maintained his innocence claiming he was not aware of the details of the policies, despite being named as the sole beneficiary.

The court heard Morant had told his wife he wanted to use the money to build a religious commune in the Gold Coast hinterland, with bunkers, as a haven from the biblical rapture.

Graham Morant claimed he wasn't aware of the details of the policies, despite being named as the sole beneficiary. ( AAP Image: Dan Peled )

In police statements of interviews presented to the court, Morant initially said he had no involvement in his wife's suicide.

But when he learnt of CCTV vision of his visit to the hardware store, his story changed.

"Slowly, very slowly, over the course of the next hour the accused explained he did assist his wife in her suicide," Crown prosecutor Michael Lehane told the court.

Morant was opposed bail until his sentencing, which will not happen until October 19 due to the complexity of the case.

He showed no emotion as the verdict was read out, but his family broke down, as did Mrs Morant's family.

The court heard there did not appear to be any precedent in Australia or internationally, in relation to the charge of counselling, and Morant's motive for the crime.

"The range is naught to life, and the different levels of criminality in these particular offences are limitless," Justice Peter Davis said.

During the trial, Mrs Morant's best friend Judy Dent told the court that Mrs Morant made it clear her husband wanted the insurance money.

Under oath, Ms Dent told the court that when Mrs Morant visited her a week before her death she said "I have to do it".

"I have to kill myself and Graham will be helping me," Ms Dent said Mrs Morant told her.

Graham Morant did not give evidence during the trial.

Outside court, Mrs Morant's sister, Lynette Lucas, said the family had not been sure what to expect from the trial.

"The truth comes out in the end … but it's been hard," Ms Lucas said.

"You're just hopeful, but you never know what the outcome is going to be — I think it's closure for Jenny."