Erin Patterson, the Australian woman accused of killing three relatives with a meal of death cap mushrooms baked in a Beef Wellington lunch, has been found guilty of three counts of murder and the attempted murder of the lone survivor.

The jury was sequestered in the same hotel as a key police witness in Erin Patterson's murder trial and two members of the prosecution's team were staying.

A jury on Monday found an Australian woman guilty of murdering three people, including her parents-in-law, by poisoning them with a dish laced with death cap mushrooms, an act that sparked a years-long legal saga and gripped the nation.