Erin Patterson's former inmate has made shocking claims about the murderer's life behind bars.
Patterson, 50, was found guilty of poisoning three of her in-laws with a lunch laced with death cap mushrooms and will be sentenced after listening to victim impact statements at the Victorian Supreme Court, starting today.
A jury convicted the Leongatha woman of murdering Don and Gail Patterson, the parents of her estranged husband, Simon, and his aunt, Heather Wilkinson.
In addition to the three murders, Patterson was also convicted of attempting to kill Heather's husband, Ian Wilkinson.
Justice Christopher Beale will decide on a head sentence and a non-parole period for the convicted killer.
