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Woman accused of killing partner says he 'searched how to get away with murder' before his death

Why a NSW grazier contemplating suicide allegedly used his partner's phone to research 'how to get away with murder' and made several future plans for his farm has been heard by a jury.

Natasha Beth Darcy told detectives during her third police interview in November 2017 that she regularly deleted her internet search history because the 'naughty stuff' her partner Mathew Dunbar looked up.

She was then asked by the officers if she seriously believed they would care about pornography after his death.

Police were investigating 'suspicious circumstances' including a google search whereby Ms Darcy questioned what gas would 'show up in an autopsy,' on the day of her partner's death

Ms Darcy suggested that 'he didn't want to get me in trouble,' when questioned about the google search

Mr Dunbar's died in his house on his property Pandora, Walcha NSW

The 46-year-old has pleaded not guilty to murdering Mathew after the 42-year-old farmer was found dead on his Pandora property in the Northern Tablelands town of Walcha on August 2, 2017.

Her guilty plea to aiding or abetting suicide was rejected by the Crown, who say she made it appear this way and the primary motive involved her being the sole beneficiary of the $3.5 million property.

Senior Constable Graham Goodwin took Darcy through dozens of iPhone searches including '99 undetectable poisons,' 'husband suspected of killing wife after stroke' and others relating to the bitterness and tastelessness of different mass murder pills.

He accused Darcy of crushing up a cocktail of pills before gassing him in his sleep, reminding her that she had previously said she was controlling his medication, the NSW Supreme Court jury was told on Monday.

'I would never hurt Mathew or poison him in any way,' she said, before later adding that she had slacked off with his medication in the week leading up to his death.

While she denied that was her Googling before Mr Dunbar's death, she said similar searches after were prompted by rumours around town she had poisoned the sheep farmer.

One horse sedative found in his autopsy was purchased by Darcy in an Armidale veterinary clinic she originally denied visiting.

But after cell tower data showed it was her, she agreed but said the receptionist appeared inept and wrote down the wrong details.

A tax invoice receipt was issued in the name of 'Natasha Pascoe' to a fake address in Walcha, and Sen Const Goodwin asked why some details like her email address and horse's name Bugs were correct.

'The girl took forever ... she was struggling ... I wasn't doing anything wrong,' Darcy said.

The Crown denied Ms Darcy's requested to change her plea to aiding suicide

Mr Dunbar died on August 2, 2017 at his property, Pandora located in Walcha, north western NSW

Mr Dunbar made arrangements for diesel fuel and pear trees to be delivered to the farm one day before he allegedly killed himself.

'Yeah he was making plans. That keeps going around in my head,' Darcy said.

Darcy told police she has no idea who ordered the gas bottle found beside his body, despite the supplier saying it was a woman who purchased it for an upcoming birthday party.

The order was placed from their home phone, and Darcy told police female visitors rarely dropped in.

'Mathew had a very feminine-sounding voice,' Darcy offered as an explanation.

After telling police she had no knowledge of Mr Dunbar altering his will to include her, she later admitted knowing it had been changed but thought it had not activated by his solicitor.

'Do you recall telling us you had no idea you were going to be the sole beneficiary,' Sen Const Goodwin said in the interview.

'I didn't at that point, no ... I didn't think it had been signed for,' Darcy replied.

She was then reminded of a phone call in May where Mr Dunbar told her 'if he dies Pandora is all yours'.

'He said that a number of times,' Darcy said.

The trial continues before Justice Julia Lonergan.

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