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Diabolical (2018) poster

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.

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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.

Latest episode

S3 E10: Evil Sister Act

Aired 12 May 2020

Seasons 3

Details

First aired
1 January 2018
Network
Investigation Discovery
Language
English
Country
Canada, United States
Type
Documentary
Rated
TV-14
homicidemurder

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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.

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