Criminal experts have described mushroom killer Erin Patterson as a ‘formidable witness’ who ‘knew what she was doing’.

Erin Patterson remained composed as a jury decided whether a poisoned beef Wellington lunch she cooked was a deliberate and callous act of murder, or a tragic accident.

In a matter of minutes, a tension built over weeks of legal arguments and disputed versions of what happened the day Erin Patterson hosted her in-laws for lunch was resolved.

The Supreme Court has lifted the lid on the “journey” of the jury that decided the fate of convicted triple murderer Erin ...