First Published: 1:15 PM PDT, May 10, 2021 Kathleen Folbigg is considered one of Australia's most notorious female killers. She was convicted of smothering her four children, one after the other, in 2003. Caleb was just 19 days old when his mother found him lifeless in his crib. Patrick died at eight months. Sarah stopped breathing at 10 months and Laura perished at 19 months. Kathleen Folbigg found each of her children dead in their beds, one after the other, over the span of a decade. In 2003, she was convicted of manslaughter in Caleb's death, and of murdering the three babies who followe...