Mike Smith
Here’s everything you need to know about the chilling true-crime docuseries, Unknown Serial Killers of America—streaming details, full episode guide, cast list, and answers to your most asked questions.
How to watch Unknown Serial Killers of America outside the US on Peacock
To watch Unknown Serial Killers of America outside the US, use a VPN and connect to a US server. Then go to Peacock’s website or app and sign in with a valid US account. This allows you to stream the full series online from anywhere.
- Subscribe to NordVPN
- Install the VPN app on your device.
- Connect to a US-based server.
- Open Peacock website or launch its app, then login or sign up for a new account.
- Watch Unknown Serial Killers of America documentary
Unknown Serial Killers of America (2025) Synopsis
Unknown Serial Killers of America is a gripping six-part docuseries that shines a spotlight on some of the most dangerous but little-known murderers in U.S. history. Unlike headline-dominating criminals, these killers operated in the shadows, avoiding media scrutiny for years. Through powerful interviews with law enforcement officials, victim families, and criminal profilers, the show uncovers how these predators eluded capture—and how they were eventually brought to justice. Each weekly episode dives into one terrifying case, offering never-before-seen footage and disturbing firsthand accounts.
When Does Unknown Serial Killers of America Premiere?
The docuseries premiered on Sunday, May 18, 2025, at 7 PM ET/PT on the Oxygen True Crime channel, with new episodes airing weekly through June 22, 2025, and became available to stream on Peacock starting July 29, 2025.
Where to Watch in the US
You can watch Unknown Serial Killers of America in the US on Oxygen via fuboTV, YouTube TV, Hulu + Live TV, DirecTV Stream, and Peacock. It’s also available on-demand through NBC and the Oxygen section of Peacock Premium. New users can stream the premiere free with fuboTV’s 7-day trial.
Where to Watch in Canada
In Canada, Unknown Serial Killers of America is available on Hayu, Crave, and the Hayu Prime Video Channel. You can also stream it for free with ads on the CTV website or app if available in your region.
Where to Watch in the UK
UK viewers can stream Unknown Serial Killers of America on Hayu, the Hayu Prime Video Channel, and NOW TV. These platforms offer both on-demand viewing and monthly subscriptions without long-term contracts.
Where to Watch in Australia
In Australia, the docuseries is available to stream on Hayu and the Hayu Prime Video Channel. Episodes can be watched on-demand with a monthly subscription to either platform.
Unknown Serial Killers of America Season 1 – Full Episode Guide
Here are the episodes:
Episode 1 – Carl Watts (May 18, 2025)
A disturbing dive into the case of Carl Watts, suspected of over 100 murders and set for early release. An eyewitness reemerges, threatening to stop a killer from walking free.
Episode 2 – William Suff (May 25, 2025)
The “Riverside Prostitute Killer” murdered 13 women in California during the 1990s, until a brave escapee helped police track him down.
Episode 3 – Daniel Conahan (June 1, 2025)
With bodies piling up along Florida’s hog trails, a chilling pattern emerges—two survivors point to a serial predator who may have murdered many more.
Episode 4 – Terry Rasmussen (June 8, 2025)
Barrels containing unidentified victims lead to a decades-long investigation of a serial chameleon who used multiple aliases across states.
Episode 5 – Maury Travis (June 15, 2025)
In Missouri and Illinois, twelve Black women are brutally killed. The murderer taunts police with disturbing footage, revealing a depraved obsession.
Episode 6 – Herb Baumeister (June 22, 2025)
Gay men start vanishing from Indiana nightlife. An amateur detective’s trail of clues uncovers a horrifying story behind a suburban façade.
Unknown Serial Killers of America (2025) Cast
This docuseries features real-life experts and contributors including:
- Law enforcement officials involved in the original cases
- Victim family members and survivors
- Criminal profilers and forensic analysts
- True crime authors and journalists
Can You Watch Unknown Serial Killers of America Online for Free?
Yes, you can watch the premiere of Unknown Serial Killers of America online for free using free trials. Platforms like fuboTV (7-day trial), DirecTV Stream (5-day trial), and Hulu + Live TV (3-day trial) all carry the Oxygen channel. Sign up, stream, and cancel before your trial ends if you don’t wish to continue.
Is Unknown Serial Killers of America Suitable for All Ages?
No, this series is intended for mature audiences only. It contains graphic discussions of murder, real crime scene footage, and disturbing reenactments. Viewer discretion is strongly advised, especially for those under 18.
Where Can I Download Unknown Serial Killers of America?
You can download full episodes of Unknown Serial Killers of America for offline viewing through Peacock Premium in the US, Hayu in Canada, UK, and Australia, or the Prime Video app if subscribed to the Hayu Channel. Make sure to use the official apps and download while connected to Wi-Fi to avoid data charges.
FAQs
Q1: What makes these killers “unknown”?
These murderers avoided media headlines and operated under the radar, often exploiting police blind spots and jurisdictional divides, making them less recognizable than more infamous names.
Q2: Is this series part of Oxygen’s “Snapped” franchise?
No, while it shares the same investigative tone and true crime storytelling, Unknown Serial Killers of America is a standalone series by Oxygen True Crime.
Q3: Is the series based on a book or podcast?
No, the series is an original production by Oxygen, developed through direct research and interviews.
Q4: Can I watch with closed captions or audio descriptions?
Yes, closed captioning is available on all official streaming platforms including Peacock, Hayu, and Prime Video Channels.
Q5: Is there a Season 2 planned?
As of now, there’s no official announcement for a second season, but given the series’ early popularity and the depth of available material, it’s highly possible.
Unknown Serial Killers of America Trailer
Here’s the trailer:
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