Oxygen True Crime has a big year ahead!

The network has announced a lineup of new shows set to debut later this year and into 2026. Among these are The Death Investigator with Barbara Butcher and Killer Grannies, both scheduled to air at the end of 2025. These series will explore intriguing crimes and the methods used to solve them, featuring insights from investigators, prosecutors, and more through fresh interviews.

Additionally, The Traitors‘ Alan Cumming will host an exciting new murder mystery series launching in 2026. For further details on these upcoming shows, continue reading below!

The Death Investigator with Barbara Butcher — Premieres Fall 2025

The first true-crime show narrated from the perspective of Barbara Butcher, one of New York’s most experienced Death Investigators. With over two decades of experience, Butcher will delve into the stories behind some of the era’s most intriguing murders, demonstrating that solving a case often relies on the vast information available at the crime scene and within the body itself.

The Death Investigator with Barbara Butcher is produced by Wolf Entertainment, Dan Cutforth and Jane Lipsitz’s Alfred Street Industries and Universal Television Alternative Studio. Dick Wolf, Tom Thayer, Dan Cutforth, Jane Lipsitz, Nan Strait, Dan Volpe, Maria Lane and Shannon O’Rourke serve as executive producers.

The Killer Among Us (WT) — Premieres Spring 2026

Hosted by Alan Cumming, a shocking murder rocks a tight-knit community to its core. But what if the crime wasn’t committed by a stranger or outsider? What if this killer is part of the community itself? Cumming brings us straight into the heart of communities where the unthinkable has happened and no one knows why — or who is responsible. If everyone is a suspect… who can you trust? With multiple suspects, layers of lies, deceit and deception, The Killer Among Us is a murder mystery where someone is playing… but it’s not a game.

The Killer Among Us is produced by Lusid Media with Zak Weisfeld and Libby Richman as executive producers and Alan Cumming as producer.

The Death Row Informant (WT) — Premieres Fall 2025

***Names have been redacted from the following series description due to an ongoing investigation of a serial killer.

Over a decade ago, a gruesome killer was convicted of murdering four women. Though police could never prove it, investigators always suspected there were many more victims. But the killer took his secrets with him to San Quentin. When he arrived on death row, a fellow inmate offered him protection on the yard. Over the course of a decade, the killer confided in this inmate, revealing details about 20+ unsolved murders for the first time. This inmate-turned-informant has now handed over 300 pages of detailed notes about the killer’s unsolved murders to Ken Mains, an ex-FBI investigator and cold case detective. Mains will work together with the informant to uncover new victims, bring closure to families, and expose one of America’s most prolific serial killers in real-time.

The Death Row Informant is produced by Wolf Entertainment, Fireside Pictures, Universal Television Alternative Studio, and Vanity Fair Studios. Dick Wolf, Tom Thayer, Jason Wolf, Patrick Deluca, Helen Estabrook, Sarah Amos, Claire Howorth and Liz Yale Marsh serve as executive producers. Kevin Brennecke serves as showrunner.

The Silent Serial Killer: Gretzler (WT) — Premieres Fall 2025

He is the serial killer you’ve never heard of … until now. In 1973, 22-year-old Doug Gretzler embarked on a cross-country road trip that spiraled into a brutal killing spree. In just three weeks, he and his accomplice, 28-year-old Willie Steelman, murdered 17 people. Their motive? A mystery that has left family members, law enforcement and experts baffled for decades. Drawing from first person interviews and over 500 hours of recorded conversations with Gretzler himself, hear his darkest confessions and the chilling psychology behind his crimes for the very first time.

The Silent Serial Killer: Gretzler is produced by Glass Entertainment. Nancy Glass, Matt Carter and Maija Norris serve as executive producers.

Killer Grannies —  Premieres Fall 2025

A true-crime series that chronicles the most shocking and unpredictable cases involving a killer no one would suspect: Grandma. In every self-contained episode, a rollercoaster ride of a case unfolds as investigators dig deep and chase every lead until they finally catch their unexpected killer. Through gripping archival footage, selective recreations and cinematic imagery, and in-depth interviews with investigators, prosecutors, friends and family, every episode will peel back the plastic cover on the couch to uncover a world of sinister plots and evil deeds unpacking why and how these maternal matriarchs of the family can turn deadly.

Killer Grannies is produced by Jarrett Creative. Seth Jarrett, Julie Insogna Jarrett and Josh Bingham serve as executive producers.

The Boston Stranglers — Premieres Winter 2026

Sixteen hours of the Boston Strangler’s lost confession tapes have emerged, offering an exclusive and unfiltered account of how Albert DeSalvo evaded police and got away with murdering 13 women… or did he? The unreleased tapes call everything into question. While Boston PD remains steadfast that DeSalvo was the killer, a trove of exclusive access possibly suggests otherwise. The Boston Stranglers is a two-hour documentary about one of the most infamous serial killings in American history, the murders that remain officially unsolved to this day, and a confession that has never been released until now.

The Boston Stranglers is produced by This is Just a Test. Aengus James, Paul Lima and Carolyn Day serve as Executive Producers.