A woman who sedated and gassed her sheep farmer partner had a shocking conversation with an undercover cop just months after murdering him.
On Tuesday Natasha Beth Darcy, 46, was found guilty of murdering Mathew Dunbar, who was found dead on in the Northern Tablelands town of Walcha on August 2 in 2017.
The Crown alleged she murdered the grazier to inherit his $3.5million property, knowing she was the sole beneficiary.
She contended the 42-year-old killed himself, but the Crown rejected her guilty plea to aiding or abetting suicide.
Natasha Beth Darcy, 46, has been found guilty of murdering Mathew Dunbar after the 42-year-old sheep farmer was found dead in his home near Walcha, northern New South Wales, on August 2, 2017
Three and a half months after murdering Mr Dunbar, Darcy told her cellmate: ‘I just got arrested for murder,’ NCA Newswire reported.
‘Oh, really?’ the other woman said.
‘Yeah,’ Darcy replied.
”F–k,’ the cellmate – who was an undercover cop – laughed.
She told him her partner took his own life but the toxicology came back and ‘they’re blaming me.’
Darcy started to cry and told the police officer about how her partner died.
Darcy (pictured) accidentally revealed to an undercover cop she knew one of the sedatives that was in Mr Dunbar’s dead body
A second undercover officer joined the pair and said she had heard detectives talking about Darcy’s partner toxicology results.
‘Did they say anything about ace? Acepromazine?’ she asked.
Acepromazine is usually used on sheep before shearing, or to sedate horses.
The drug was one of four sedatives found in Mr Dunbar’s blood, and it seemed unusual that Darcy would know that.
Later in the cell she admitted to searching acepromazine and clonidine – another of the drugs found in Mr Dunbar’s blood – after he died.
‘I didn’t think I had anything to hide … but it sounds like I do,’ she said seeming to realised her mistake.
Darcy will face a sentence hearing in October.
Prosecutor Brett Hatfield alleged Darcy planned the murder for some time, citing hundreds of Google searches on death methods starting with poisonous spiders and fungi which started back in February, 2017.
He said she sedated her partner using a Nutribullet to blend a cocktail of sedatives, before moving a gas tank into his room and gassing him in his bed.
Prosecutor Brett Hatfield alleged Darcy planned the murder for some time, citing hundreds of Google searches on death methods starting with poisonous spiders and fungi
The jury was told of a letter Darcy sent to a friend after Mr Dunbar’s death, offering her $20,000 to tell lies about him that would assist her at any murder trial.
Agreed facts tendered in the case state that in 2009, Darcy hit her husband, Colin Crossman, on the head with a hammer as he slept.
Three days later when he was again asleep she took a tin of petrol from the garage and poured it on the bedroom floor and set it alight.
She had earlier given him a meal of tacos and samples later showed he had sedatives in his system.
The previous month, she had taken out a life insurance policy which paid $700,000 to her on the death of Mr Crossman.
Darcy, the sole beneficiary of a Dunbar’s estate (pictured) googled redback spiders and mushrooms six months before his death
Mr Hatfield said these events indicate Ms Darcy has a tendency to sedate and inflict serious harm on her domestic partners for financial gain.
Darcy claimed her partner had taken his own life because he was depressed about his sexuality and a severe leg infection, the Brisbane Times reported.
She’d phoned triple 0 after claiming she found her partner dead in his bed.
Some of Darcy’s Google searches included ‘how to commit murder’ and ‘can police see websites you visit on your mobile’.
The mother had also carried out two ‘dry runs’ on Mr Dunbar to test the effects of drugs.
The court heard Darcy had been spreading lies about Mr Dunbar’s mental health issues to friends and family, and told them he was gay.
Image tendered as evidence shows a NutriBullet cup in the dishwasher at Mathew Dunbar’s property in Pandora