System Releases Him Thirteen Months Before He Murders Three

System Releases Him Thirteen Months Before He Murders Three: The serial murders of Nicole Paterson, Margaret Josephine Mack, and Mersina HalvagisSeptember 1996. A man with sixteen documented sexual assault convictions walks free from a Victorian prison. Psychiatric records flag him as high-risk. No one stops him. Thirteen months later, a woman is found dead with injuries Australian forensic science had never documented before.In this investigation, we examine how Peter Dupas moved through decades of institutional cycles-arrested, convicted, released, reoffended-each time the system processing him without breaking the pattern. We reconstruct the three murders that finally caught him, the forensic signatures that linked them, and the central question: why did a system with complete knowledge of his escalating violence repeatedly set him free?Victim: Nicole Paterson, Margaret Josephine Mack, Mersina HalvagisLocation: Melbourne, Victoria, AustraliaDate: 1997-1999Status: Convicted; three life sentences- A man released in September 1996 with sixteen prior sexual assault convictions and documented psychiatric warnings against release- A forensic signature so specific-mutilation of breasts and surgical placement-that it appeared in case files as unprecedented in Victorian records- Investigators discovered he had called Nicole Paterson's phone fifteen times in forty days while denying ever knowing her- His grandfather's grave was 128 meters from Mersina Halvagis's body, and he rented a hotel directly across from the cemetery where she was foundPeter Dupas, Nicole Paterson, Margaret Josephine Mack, Mersina Halvagis, Melbourne Victoria Australia, 1997, homicide, serial killer, forensic signature, criminal justice system failure, recidivism, true crime EnglishTo listen to this podcast ad-free and access premium episodes, try our subscription with a 14-day free trial at obomedia.com.© 2026 OBOMEDIA. All rights reserved.This episode and its content (audio, text, and related materials) are the exclusive property of OBOMEDIA and are protected by applicable copyright laws. Reproduction, distribution, editing, or commercial use, in whole or in part, without prior written permission from OBOMEDIA is prohibited. For permissions, licensing, and business inquiries: [email protected] listen ad-free and access premium episodes, start your 30-day free trial at obomedia.comOBOMEDIA presents true crime storiesa true crime podcast built on real cases.Every true crime story in our crime files follows the crime investigation from the missing person report to the trial: investigators and police building a murder case, a police investigation gone cold, justice for the victim and those who survived.We open the unsolved murder, the cold case reopened decades later, the mysterious death, the disappearance, the serial killer, the family murder, the murder mystery; the missing persons  a missing woman, a missing girl, a missing man found dead and the missing and murdered.From the infamous case to the unsolved case, from classic true crime to dark true crime and disturbing true crime: true crime reports, real crime stories, real murder cases, true murder stories and unsolved mysteries one true crime case at a time, from the OBOMEDIA true crime vault.© 2026 Created with OBOMEDIA technology. All rights reserved. This episode and its content (audio, text and related materials) are the property of their respective creator and are distributed under the OBOMEDIA name on platforms such as Apple Podcasts, Spotify, Amazon Music and Pocket Casts. Reproduction, distribution, editing or commercial use, in whole or in part, without prior written permission is prohibited. For permissions, licensing and business inquirie