Rick and Julene Thorburn portrayed themselves as the perfect foster parents, a happily married couple with two talented sons, living on an idyllic property near Brisbane. But behind closed doors, the Thorburns were as evil as could be, as 12-year-old schoolgirl Tiahleigh Palmer tragically found out. In 2015, ten months after she was unwittingly placed in the Thorburns' care, one of the sons sexually abused her. But it's what happened when the abuse was discovered that is truly horrific. To protect his son from punishment, Rick Thorburn murdered Tiahleigh. Then the entire family callously concocted a story to hide their crimes from police. This wicked subterfuge went on for almost a year until police finally had a breakthrough. On 60 MINUTES, Tara Brown reveals what went on in the Thorburn house of horrors, and how the case was finally solved (2018). WATCH more of 60 Minutes Australia: https://www.60minutes.com.au/ LIKE 60 Minutes Australia on Facebook: https://www.facebook.com/60Minutes9 FOLLOW 60 Minutes Australia on Twitter: https://twitter.com/60Mins FOLLOW 60 Minutes Australia on Instagram: https://www.instagram.com/60minutes9 For forty years, 60 Minutes have been telling Australians the world’s greatest stories. Tales that changed history, our nation and our lives. Reporters Liz Hayes, Allison Langdon, Tara Brown, Charles Wooley, Liam Bartlett and Sarah Abo look past the headlines because there is always a bigger picture. Sundays are for 60 Minutes. #60MinutesAustralia