Former Australian police detective Duncan McNab shared his insights on Erin Patterson, who poisoned her family members with a beef wellington spiked with death-cap mushrooms.
I've met some killers in my time, and some of them just view other people as an inconvenience, a trouble to be removed.
McNab told RNZ's Saturday Morning that Patterson never expected anyone to survive the deadly lunch, particularly Ian Wilkinson.
Author's summary: Erin Patterson's conviction for poisoning her family members sparked public interest.