Kallista Mutten, 40, took to the witness stand on Monday to give evidence against her former partner Justin Stein in the NSW Supreme Court in Parramatta on Monday.
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Kathleen Folbigg was convicted in 2003 of murdering three of her children, and of manslaughter in the death of her fourth. Folbigg maintained her innocence and said the children had died of natural causes over a decade, from 1989-1999.