A woman imprisoned for 20 years over the deaths of her four children, and pardoned in June, saw her convictions quashed by New South Wales state on Thursday, with her lawyer saying she plans to claim "substantial" compensation. 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.