For the past nine weeks, a jury of 11 men and women have heard evidence in the trial of Natasha Beth Darcy, who stands accused of murdering Mathew Dunbar at his Walcha farm on August 2, 2017.

The 11-person jury was lead into the NSW Supreme Court yesterday morning, and Justice Julia Lonergan told them she would finish her summing up of the case on Monday. She said she would send them home earlier than expected yesterday.

"There's things that need to be sorted out and debated without you," Justice Lonergan told them.

Justice Lonergan said she would "lock down those final things" and finish the summing up first thing next week so that she could "send you out on Monday to start your deliberations".

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Darcy, aged 46, denies giving the Walcha sheep grazier a drug-filled blended drink and then gassing him in bed before his 2017 death.

Prosecutor Brett Hatfield claims Darcy made dozens of searches from February 2017 on how to murder or poison her partner, in order to inherit his multi-million dollar property 'Pandora'.

Defence barrister Janet Manuell SC said "there is obviously evidence that Ms Darcy told a lot of lies".

Ms Manuell said the Crown must rule out the reasonable possibility that Mr Dunbar "died by his own hand", and added, "we say there are at least 12 reasons why the Crown can't do that".

Darcy has pleaded not guilty to murder but at the start of her trial offered a plea of guilty to aiding or abetting suicide, which was rejected by the Crown.

On Thursday, Justice Lonergan said the defence had not suggested "that you would or could bring in such a verdict" in its closing statements.

"Assisted suicide should be put out of your mind entirely," she told the jury.

The trial continues on Monday.

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