About this season
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.
Episodes (10)
1. Mother Of All Lies
Aired 21 May 2019 • 42 min
In 2015, Detective Scott Sanderson finds himself investigating one of the strangest cases of his career, involving a missing woman and her newborn; before long, he uncovers a diabolical scheme that will destroy the lives of everyone it touches.
2. Who Needs Enemies
Aired 27 May 2019 • 42 min
A cold morning in December starts off like any other, then a farmer finds the body of a dead woman; what seems like a rape and murder case turns into a conspiracy, and someone's diabolical nature is soon revealed.
3. Someone's Lying
Aired 28 May 2019 • 42 min
On April 17, 2015, a Virginia hunter makes a grisly discovery in the woods, finding a woman with an execution-style gun shot wound to the back of her head.
4. Recording Evil
Aired 4 June 2019 • 42 min
Gina Coccia comes home from work to discover the bodies of her girlfriend, Lynn, and Lynn's nephew, Ronnie, shot and stabbed on the kitchen floor; the investigation leads police to a terrifying act of betrayal.
5. Queen Of Deception
Aired 11 June 2019 • 42 min
In Susanville, CA, a beloved police officer is found dead in what looks like an apparent suicide, then detectives launch a full-blown murder investigation and zero in on the officer's wife as a possible suspect.
6. Control Freak
Aired 18 June 2019 • 42 min
Donna Scrivo hasn't seen her adult son, Ramsay, in days, and she's worried; she alerts the police, but days pass with no sign of him anywhere; then the discovery of a severed head and body parts along a highway reveals an act of shocking violence.
7. The Rich Get Richer
Aired 25 June 2019 • 42 min
Penny Knell is admitted to a special care facility, where a devious mastermind is waiting to prey on vulnerable people; when Penny's family gets ensnared in her web, the consequences will be fatal.
8. A Life Of Lies
Aired 2 July 2019 • 42 min
In Prichard, AL, loving father Re'Mano Campbell is found murdered in his home; it takes the cunning wit of local investigators to unravel the mystery of who murdered him.
9. Murder Is No Accident
Aired 9 July 2019 • 42 min
A vivacious 33-year-old drowns in the middle of a crowded lake. The investigation untangles a dark, nefarious past that includes theft and multiple murders and detectives must take extraordinary measures to catch the killer.
10. When All Else Fails
Aired 16 July 2019 • 42 min
After her home is invaded and her husband murdered, Shaunna Dodd recounts her harrowing ordeal at gunpoint; however, when investigators dig deeper, they uncover a tale of lies, infidelity and shady characters who have wandered into the Washoe Valley.