Motive & Method

A three-year-old disappears. A teenager confesses. Yet more than five decades later, Cheryl Grimmer’s family is still fighting for justice.
Cheryl Grimmer vanished from a beach change room in 1970, and despite a detailed confession decades later, no one has ever been held accountable for her murder. In this powerful interview, Cheryl’s brothers, Paul Grimmer and Ricki Nash, share the devastating impact her disappearance has had on their family and their decades-long fight for justice.
They raise troubling questions about missed investigative opportunities, a confession that was ultimately ruled inadmissible, and why they believe authorities failed to properly pursue Cheryl’s case. More than 50 years on, they continue to demand answers and the chance for their little sister to finally have her day in court.
More episodes of Australia's Killer Secrets coming soon...
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What if Ivan Milat’s first victim was killed more than two decades before the backpacker murders?
Keren Rowland was 5 months pregnant when she was brutally murdered and hidden in a pine forest in 1971. In this episode, Tim & Xanthe sit down with Keren's brother Steve Rowland and former UK detective Hugh Hughes.
They detail years of fighting for answers, alleging police ignored crucial leads, withheld information and failed to properly investigate Milat despite mounting evidence linking him to Keren’s murder.
More than 55 years on, the family is still asking the question that haunts this case: if police had done more back then, could Ivan Milat have been stopped before his backpacker killing spree began?
More episodes of Australia's Killer Secrets coming soon...


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A twin brother's 47-year fight for answers, suspicious letters and a new witness who may hold the key to where Kay Docherty is buried.
In this episode, Kevin Docherty shares the heartbreaking story of his sister Kay Docherty, who vanished alongside her friend Toni Cavanagh in 1979. Nearly five decades on, Kevin recalls the night they disappeared, the suspicious letters sent to their families days later, and the long fight for answers after police initially treated the case as a runaway.He also reveals new information from a recently emerged witness that may not only point to Ivan Milat, but to a potential burial site that has never been searched.
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Families demand answers - police under scrutiny - and a revelation that could reshape the Milat case.
At the first hearing into dozens of Australia’s unsolved murders and missing persons cases, police revealed a previously unheard list of potential additional victims linked to Ivan Milat.
In this episode, forensic scientist and criminologist Dr Xanthe Weston and criminal psychologist Tim Watson-Munro take you inside the landmark parliamentary inquiry in Bowral, NSW. They unpack the heartwrenching testimony from families still searching for answers, and their sharp criticism of police.
Plus, the expert evidence they presented to the inquiry about Ivan Milat’s motives, methods and the murders they believe he may have gotten away with.
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What if the full story behind Australia's most notorious serial killer Ivan Milat has never been told?
In episode one of this special series of Motive&Method, forensic scientist Dr Xanthe Weston and criminal psychologist Tim Watson-Munro break down the unsolved missing & murdered cases being re-examined in a landmark parliamentary inquiry.
Tim & Xanthe have been working for years, alongside family members, on many of these cases. Now they're being called to give their expert submissions, highlighting the evidence and potential links in some of the investigations.
In Australia's Killer Secrets, Tim & Xanthe are taking you inside the hearings to explore the evidence - talking to family, police and politicians - in this new search for answers in some of Australia's most enduring mysteries.

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