Kathleen Kolbigg is either a grieving mother who tragically and unusually lost four of her babies - or she’s Australia’s worst female serial killer. It really depends on who you ask. Kathleen - who goes by Kathy - would lose four of her young children tragically between the years 1989 and 1999. Babies Caleb, Patrick, Sarah and Laura were between the ages of 19 days old and 19 months old when they died. Initially, it was believed that sudden infant death syndrome (SIDS) was the cause of death in at least two of the children, however, after 19-month-old Laura suddenly passed away after a nap, investigators began to take a closer look.

Sources:
https://www.tandfonline.com/doi/pdf/10.1080/00450610701324916
https://www.mamamia.com.au/kathleen-folbigg-inquiry-diary
/https://www.theguardian.com/australia-news/2023/jun/05/kathleen-folbigg-pardoned-after-20-years-in-jail-over-deaths-of-her-four-children
https://www.crimelibrary.org/notorious_murders/women/folbigg/3.html
https://youtu.be/fAcEQpGiV5w

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