An Australian jury has begun its first day of deliberations in the trial of Erin Patterson - accused of deliberately manufacturing a murderous mushroom lunch.

She's facing three murder charges and one of attempted murder over the toxic meal she served her estranged husband's relatives.

Australian correspondent Oliver Peterson says there's just over an hour left of deliberating time today.

"4:15 Melbourne time is when they will wrap up - and they've back in the court every day, including Saturdays, so they can reach a verdict."

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