

TV series
Diabolical
2018–, English, on Investigation Discovery.
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.
- Seasons
- 3
- Episodes
- 30
- Episode length
- 42 min
- Status
- Still running
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Where to watch Diabolical
Diabolical is streaming on HBO Max, Philo, and Discovery+ in India.
Stream
Availability in India as of 10 November 2026. Streaming data by JustWatch.
Latest episode
S3 E10: Evil Sister Act
Aired 12 May 2020
Seasons 3
Cast & crew
Details
- First aired
- 1 January 2018
- Network
- Investigation Discovery
- Language
- English
- Country
- Canada, United States
- Type
- Documentary
- Rated
- TV-14
Check ratings elsewhere
News & fan talk
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Diabolical: quick answers
Is Diabolical worth watching?
Diabolical doesn’t have enough ratings for a verdict yet.
How many seasons of Diabolical are there?
Diabolical has 3 seasons and 30 episodes, about 42 minutes each.
Is Diabolical finished?
Diabolical is still listed as returning series; no new episode date is announced yet.
Which OTT platform is Diabolical on?
Diabolical is streaming on HBO Max, Philo, and Discovery+ in India. (Checked 10 November 2026.)
Diabolical parents guide: is it suitable for kids?
Diabolical is rated TV-14. Check the rating guidance before watching with young children.
What shows are like Diabolical?
If you liked Diabolical, try I AM A KILLER, Homicide Hunter: Lt Joe Kenda, Evil Lives Here.
