Case 252

Margaret Maher, Mersina Halvagis & Nicole Patterson

*** Content warning: serial rapist and killer, sexual assault, stalking ***

When Melbourne women Margaret Maher, Mersina Halvagis and Nicole Patterson were found brutally murdered in the late 1990s, police didn’t immediately link the crimes. The killer left behind no incriminating evidence, indicating he was an experienced offender who knew how to beat the system.

Little did investigators know, the story began almost 30 years earlier, when a 15-year-old boy knocked on his neighbour’s door and asked to borrow a knife.



Casefile Presents



Research & writing – Milly Raso

Creative direction – Milly Raso

Narration – Anonymous Host



‘Flatline intro’ and ‘Come play with me’ intro and outro –

Audio production – Mike Migas 

Scoring – Mike Migas and Andrew Joslyn



Logo and website design – Paulina Szymanska



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Rot in Hell: Peter Dupas – the mutilating monster – Jim Main



Killer’s wife tells of doomed marriage – The Age

Dupas asked neighbour’s daughter to stay on eve of attack – The Age

Body ‘looked like mannequin’ – The Age

$1m reward to find Halvagis killer – The Age

Jailed lawyer holds key to Halvagis case – The Age

Dupas interviewed over cemetery stabbing – The Age

Dupas faces murder charge – The Age

Disgraced lawyer applies for $1m Halvagis reward – The Age

Peter Dupas dobbed in again by Andrew Fraser – The Age

Serial killer Peter Dupas has inflicted misery on many – Herald Sun

Call for second life term for murderer Dupas – The Age

Killer’s grisly trademark his downfall – The Sydney Morning Herald

A signature killer – The Age

Family’s frustration at murder appeal – ABC News

Appeals court overturns Dupas murder conviction – The Age

Serial killer Dupas to die in jail – The Age

Peter Dupas charged with murder of 95yo Kathleen Downes at Melbourne nursing home – ABC News

Prosecutors drop murder case against notorious killer Peter Dupas – Nine News

Serial killer Peter Dupas linked to three unsolved cases –

What we can learn from the murder of Mersina Halvagis –

‘Pure evil’ killer who raped and mutilated victims kept being freed to murder again – Daily Star



Judge regrets he is unable to order medication for rapist – The Age

Murder in cemetery a mystery – The Age

Cemetery killing a random attack: police – The Age

Killer may have stalked others – The Age

Police seek help in murder case – The Age

Police, family appeal for help to solve murder at cemetery – The Age

Reward in murder case – The Age

Senseless killing. Endless grief – The Age

Patients sought after stabbing – The Age

Man questioned on stabbing – The Age

Bloody jacket key to murder, court told – The Age

United in grief by a tragic coincidence – The Age

Precious memories sustain grieving family – The Age

A chilling case of legal deja vu – The Age

A speechless denial of life – The Age

The man who won’t give up – The Age



Peter Dupas – Beyond the Darklands



Peter Dupas: The Ordinary Monster – Crime Library

Helen McMahon – Victoria Police

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