Kathleen Folbigg spent 20 years in prison for the death of her four children. For much of that time, she was pilloried as the worst female serial killer in Australian history. Then, on Monday, she was released from prison. In a news conference, the NSW Attorney General announced that Folbigg, now 55, had been pardoned.  Today, legal affairs reporter Michaela Whitbourn on what’s been called the largest injustice in Australian legal history, and what will happen now to the woman at the centre of it.Subscribe to The Age & SMH: https://subscribe.smh.com.au/See omnystudio.com/listener for privacy information.