Is Diabolical coming back?
Diabolical (2018–2020) — crime on Investigation Discovery
Watch on Discovery+ 
About Diabolical
Diabolical ended on May 12, 2020, on Investigation Discovery. The show concluded after its third season, which aired from March to May 2020. Its final episode was titled 'Evil Sister Act' and aired on May 12, 2020.
Diabolical was a crime documentary series that explored the psychological motivations behind murderers. Premiering on January 1, 2018, the series examined how seemingly normal individuals could harbor dark secrets that lead to violent crimes. Each episode delved into real criminal cases, providing insights from forensic psychologists, psychiatrists, and criminal profilers to analyze the behavioral and emotional factors involved.
Each episode had a runtime of approximately 60 minutes, focusing on the complex minds of murderers and the events that culminated in murder.
Diabolical episode schedule
30 aired
Aired · 30
| Date | Ep. | Title |
|---|---|---|
| May 12, 2020 | S3·E10 | Evil Sister Act |
| May 5, 2020 | S3·E9 | Killer Track Record |
| April 28, 2020 | S3·E8 | Caught in the Cover-Up |
| April 21, 2020 | S3·E7 | Devil Wears False Eyelashes |
| April 14, 2020 | S3·E6 | Teach Me to Kill |
| April 7, 2020 | S3·E5 | Sins of a Mother |
| March 31, 2020 | S3·E4 | Lie for Me |
| March 24, 2020 | S3·E3 | Masking Evil |
| March 17, 2020 | S3·E2 | Hands That Rob the Cradle |
| March 10, 2020 | S3·E1 | Daddy's Little Nightmare |
| July 16, 2019 | S2·E10 | When All Else Fails |
| July 9, 2019 | S2·E9 | Murder Is No Accident |
| July 2, 2019 | S2·E8 | A Life of Lies |
| June 25, 2019 | S2·E7 | The Rich Get Richer |
| June 18, 2019 | S2·E6 | Control Freak |
| June 11, 2019 | S2·E5 | Queen of Deception |
| June 4, 2019 | S2·E4 | Recording Evil |
| May 28, 2019 | S2·E3 | Someone's Lying |
| May 27, 2019 | S2·E2 | Who Needs Enemies |
| May 21, 2019 | S2·E1 | Mother of All Lies |
| May 10, 2018 | S1·E10 | Living Off the Dead |
| May 3, 2018 | S1·E9 | Weeping Widow |
| April 26, 2018 | S1·E8 | Accident Waiting to Happen |
| April 19, 2018 | S1·E7 | Family or Foe |
| April 12, 2018 | S1·E6 | Mother of All Murders |
| April 5, 2018 | S1·E5 | Best of Friends |
| March 29, 2018 | S1·E4 | Who Lies Beneath |
| March 22, 2018 | S1·E3 | Til Death Do We Part |
| March 15, 2018 | S1·E2 | Lying for Love |
| January 1, 2018 | S1·E1 | Mistress Roulette |