Kathleen Folbigg Is Pardoned; Australian Official Cites ‘New Evidence’

Two decades ago, Kathleen Folbigg was convicted of smothering all four of her young children. Australian tabloids called her the country’s worst female serial killer.

But Ms. Folbigg, who was sentenced to 40 years in prison, insisted she was innocent. And in recent years, a growing number of scientists began to argue that she was telling the truth. Genetic evidence, they said, indicated that the children had very likely died of natural causes.

On Monday, the attorney general of New South…