
Like trying to decipher the value of a book without ever opening it, judging a person by his or her outward appearance can be a mistake. Someone may look perfect on the outside, but even the most kind-hearted soul has a dark side looming. "Diabolical" is a docuseries that delves into the minds of murderers, asking a simple question: "Why did they do it?" The acts were committed with extreme premeditation -- many were months or even years in the making. Tension builds in each episode as law enforcement taps into the methods of devious masterminds, aided by insights from forensic psychologists and psychiatrists as well as criminal profilers.

Season 1
No episodes found for this season.
Featuring
Ross Huguet
Narrator (voice)
Keep watching
6.62011·6.6
Special Affairs Team TEN
2011 · Series
7.22025·7.2
Patience
2025 · Series
8.02026·8.0
Honeymoon Se Hatya
2026 · Series
7.52021·7.5
The Chestnut Man
2021 · Series

2021
The Lie Detective
2021 · Series

2021
Brennpunkt: Philips vei til terror
2021 · Series
6.12019·6.1
Face to Face
2019 · Series
8.62025·8.6
Homicide Squad New Orleans
2025 · Series

2022
Mafia Connection
2022 · Series
8.01998·8.0
The FBI Files
1998 · Series

2000
Perfect Murder, Perfect Town
2000 · Series
7.51997·7.5
Midsomer Murders
1997 · Series
6.52014·6.5
Gap Dong
2014 · Series
8.11971·8.1
Columbo
1971 · Series
8.52013·8.5
Peaky Blinders
2013 · Series
7.22013·7.2
Hinterland
2013 · Series
8.42019·8.4
Villain: Perpetrator Chase Investigation
2019 · Series
6.61992·6.6
Dateline
1992 · Series

2024
Murder Down Under
2024 · Series
3.02016·3.0
Stalkers Who Kill
2016 · Series
Picked for you
6.52022·6.5
Crime Scene: The Texas Killing Fields
2022 · Series
7.82022·7.8
Conversations with a Killer: The Jeffrey Dahmer Tapes
2022 · Series
6.92018·6.9
I AM A KILLER
2018 · Series
8.92011·8.9
Homicide Hunter: Lt Joe Kenda
2011 · Series
8.02016·8.0
Evil Lives Here
2016 · Series
6.61992·6.6
Dateline
1992 · Series
7.52026·7.5
Trust Me: The False Prophet
2026 · Series
7.42026·7.4
Worst Neighbor Ever
2026 · Series
7.42026·7.4
Death of the Pastor's Wife
2026 · Series
8.12015·8.1
See No Evil
2015 · Series
6.82026·6.8
The Idaho Murders: College Nightmare
2026 · Series
7.02024·7.0
Homicide
2024 · Series
6.82021·6.8
The Murders at Starved Rock
2021 · Series
8.12014·8.1
Web of Lies
2014 · Series
7.32024·7.3
Cold Case: Who Killed JonBenét Ramsey
2024 · Series
7.12023·7.1
How I Caught My Killer
2023 · Series
6.72022·6.7
Killer Sally
2022 · Series
7.02016·7.0
Inside the World's Toughest Prisons
2016 · Series
7.12018·7.1
Dirty Money
2018 · Series
7.52023·7.5
American Manhunt: The Boston Marathon Bombing
2023 · Series