Kathleen Folbigg was sentenced to 25 years in prison in 2003 on charges of killing her four children. The children, aged between 19 days and 19 months, died suddenly between 1989 and 1999.

immunologists have discovered that the woman's two daughters shared a genetic mutation - called CALM2 G114R - that can cause sudden cardiac death. The two sons, however, had a different genetic mutation, linked to sudden epilepsy in mice. Now he could sue the government, demanding millions of dollars in compensation.