Erin Patterson was convicted in July of murdering Don and Gail Patterson and Gail's sister, Heather Wilkinson, with a lunch of beef Wellington pastries and foraged death cap mushrooms.

Erin Patterson's former inmate has made shocking claims about the murderer's life behind bars.

Two-day pre-sentencing hearing at Victorian supreme court comes after Patterson was found guilty of triple murder and attempted murder on 7 July