Australian Erin Patterson can now be called a triple-murderer after a nine-week trial ended in a guilty verdict.

A jury has unanimously agreed the 50-year-old deliberately laced a beef wellington with death cap mushrooms, killing three members of her estranged husband's family.

She's also been found guilty of attempting to murder a fourth person, after a jury deliberated more than six days.

Australian correspondent Oliver Peterson says each charge carries a maximum penalty of life in prison.

LISTEN ABOVE

• Erin Patterson: Jury begins deliberations as trial enters 10th week
• Erin Patterson trial: Jury to begin deliberations
• Erin Patterson trial: Justice Christopher Beale delivers instructions to jury
• Erin Patterson mushroom trial: Defence wraps up case
• Erin Patterson accused of lies and inconsistencies as mushroom trial continues