Under Investigation Season 5

Loving couple Ray and Jennie Kehlet join colleague Graham “Grumpy” Milne on a gold-prospecting trip to the red heart of Western Australia. Three people go out but only one comes back. Then a body is found in a remote mineshaft. With a senior member of the police investigative team joining our panel of UI experts, the case is laid open as never before.

Australia's first celebrity chef, star of radio and television Willi Koeppen, runs one of the country's most successful restaurants before he vanishes without a trace in 1976.

One of the world's most unforgivable legal scandals. How South Australia's Chief Forensic Officer operated for decades with barely a qualification, providing false evidence.

Australia's most baffling maritime mystery, the 1988 disappearance of the Patanela just 10 miles off the coast of Sydney. No distress call. No debris. All four on board lost without a trace. What really happened to the Patanela?

He was brave enough to stand up to the mafia in a country town. But Don Mackay paid the ultimate price. His enemies weren't just mafia living by the creed: You speak, you die. He was also facing a political insider.

Four young police officers sent to a rural property are ambushed by violent extremists. They faced the siege at Wieambilla - the point when conspiracy became violence.

One of Australia's most senior officers was killed in his own driveway they suspected a professional hit. Investigators jailed and then freed another. Who killed Colin Winchester?

Richard Dorrough, ex-navy sailor, took his own life in 2014. He left behind a shocking note claiming to have murdered three people, but no details to identify the victims.

Liz Hayes and her team of investigators assemble formerly top-secret diplomatic documents to expose what really happened to the Balibo Five, a team of Australian journalists executed in East Timor. Their deaths mark the beginning of a shameful government cover-up that continues tonight.