These ten podcast episodes explore some of the most disturbing and well-documented cases of mass murder and serial killing in modern criminal history. Selected from a wide range of true crime podcasts, each episode digs into the psychology, investigation, and impact of perpetrators who killed multiple victims — spanning the UK, North America, Australia, and beyond.

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Morbid

→ Morbid: Dennis Nilsen and the Case of The Kindly Killer in London

This episode of Morbid dives into the disturbing case of Dennis Nilsen, a British civil servant who murdered at least 12 young men in London between 1978 and 1983. Known as "The Kindly Killer" for his charming facade, Nilsen lured victims into his home before killing them and keeping their remains. The episode explores who Nilsen was, how he operated undetected for years, and what finally led investigators to his door.

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Morbid

→ Morbid: Dennis Nilsen and the Discovery of the Remains in the London Sewer

This follow-up episode covers the moment everything unraveled for Dennis Nilsen — when human remains were discovered blocking a drain in North London. The Morbid hosts examine how forensic investigation and witness accounts led to Nilsen's arrest, the chilling confession that followed, and the harrowing details of what authorities found inside his home. A gripping continuation of one of Britain's most disturbing serial killer cases.

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Uncover: Calls From a Killer

→ Uncover: Calls From a Killer investigates Clifford Olsen's murder of 11 children

This episode investigates Clifford Olson, one of Canada's most notorious serial killers, who murdered 11 children and young people in British Columbia in 1980–1981. The podcast examines how Olson manipulated both victims and authorities, and how the RCMP eventually closed in on him. The case remains one of the darkest chapters in Canadian criminal history, made even more disturbing by Olson's willingness to communicate with investigators.

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Uncover: Calls From a Killer

→ Uncover: Calls From a Killer — Clifford Olson and the RCMP's Hunt in 1981

In this episode, the Uncover podcast reconstructs the RCMP's desperate 1981 manhunt for Clifford Olson as more children went missing across British Columbia. The episode highlights the investigative challenges, missteps, and moral dilemmas that defined the case — including the controversial deal Olson struck with authorities. An essential listen for understanding how law enforcement pursued a killer who seemed to stay one step ahead.

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Fifteen: Inside the Daniel Marsh Murders

→ Fifteen: Inside the Daniel Marsh Murders: Daniel Marsh and the Murders in Davis

This episode introduces the shocking case of Daniel Marsh, a teenager from Davis, California, who murdered an elderly couple in 2013. The podcast explores the disturbing nature of Marsh's crimes, his psychological profile, and the investigation that led to his conviction. The episode raises profound questions about juvenile violence, mental illness, and the justice system's response to crimes committed by minors.

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Fifteen: Inside the Daniel Marsh Murders

→ Fifteen: Inside the Daniel Marsh Murders: Episode 2 - The Crime Scene

The second episode of this series takes listeners inside the crime scene where Daniel Marsh murdered Oliver and Claudia Northup in Davis, California. Through detailed forensic analysis and testimony, the podcast reconstructs the events of that night and examines what the evidence revealed about Marsh's mindset. A carefully reported episode that balances sensitivity toward victims with unflinching investigation of a disturbing crime.

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The Hand in the Window

→ The Hand in the Window: Shawn Grate and the rescue of Jane Doe in Ohio

This episode tells the story of Shawn Grate, an Ohio serial killer whose capture came only when a survivor managed to call 911 from her captor's phone. The podcast follows the dramatic rescue of a woman known as Jane Doe and the subsequent investigation that linked Grate to the murders of multiple women across Ohio. A harrowing case that highlights both the horror of serial predation and the bravery of a single survivor.

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The Hand in the Window

→ The Hand in the Window: Shawn Grate and the hunt for the missing women in Ohio

This episode expands the investigation into Shawn Grate, examining how multiple women went missing in Ohio before authorities connected the disappearances to a single perpetrator. The podcast explores the failures and breakthroughs in the investigation, the communities affected by the murders, and how Grate managed to evade detection. A deeply reported episode about a serial killer hiding in plain sight in small-town America.

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Stolen Sister

→ Stolen Sister: Elizabeth Plunkett and Ireland's First Serial Killers

This episode of Stolen Sister examines the murders attributed to John Shaw and Geoffrey Evans — considered Ireland's first identified serial killers — who abducted and killed young women in the 1970s. Elizabeth Plunkett was among their victims. The podcast explores the investigation, the killers' profiles, and the lasting impact on Irish society, offering a rare deep dive into a chapter of Irish criminal history that is rarely discussed.

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Untold True Crime

→ Untold True Crime dykker ned i Zodiac Killer-mysteriet

This episode of Untold True Crime examines the enduring mystery of the Zodiac Killer, who terrorized Northern California in the late 1960s and early 1970s, claiming at least five confirmed victims while taunting police and the press with cryptic letters and ciphers. The episode reviews the key evidence, the most credible suspects, and why the case has never officially been solved — making the Zodiac one of the most haunting unsolved mass murder cases in American history.