Original title
Diabolical
Released
1/1/2018
Origin country
CA, US
Genre
Crime, Documentary, Family, Reality
Production companies
Lion Television, MPH Entertainment Productions
Status
Returning series
Number of seasons
3
Number of episodes
30
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.
Married family man Dr. Adam Frasch has a booming practice, and he loves to spend money on houses, automobiles and exotic dancers; ultimately, the doctor will reap what he sows in deceit and jealousy.
Temptress Cathy Cousin moves in next door to devoted family man Tim Koile, wrapping him around her finger and convincing him to satisfy her every whim no matter how diabolical.
Lyle and Carol Kopenskey are high school sweethearts who marry after graduation; after 40 years of marriage, one of them becomes involved in an extra-marital affair that leads to cold-blooded murder.
Valuing wealth more than love, Michelle Donohue casts aside good men before meeting Mr. Right who gives her a taste of her own medicine and sends her down a murderous path.
After sneaking out to attend a party, 19-year-old Jose Najera returns home to find both of his parents dead in their bedroom. It is unclear if it is a random killing or a botched robbery.
Janet Lynn Mickey dreams of starting her own family and marries college football star Darrell Tyburski; plans change after the young couple begins having children, leading them down a very dark path.
A young family is on an evening stroll when suddenly terror strikes. Nothing seems to add up during the investigation, it is not clear if it is random violence or a mastermind at work and the truth will take years to emerge.
Single mom Rainey Morin thinks she has found her one and only soulmate in Robert Kowalski. However, beneath his bright veneer is a dark history threatening to wreak havoc upon her life and those around her.
After losing her husband in a tragic accident, a God-fearing Cindy McKay claims she has to bend the law to pay off his illicit debts; authorities soon realize that Mckay is a criminal mastermind.
George Kalomeris is a family man who looks after the less fortunate in his community, then a dying man fingers Kalomeris as the shooter, and police discover a monster more diabolical than anyone could ever imagine possible.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
In 2017, Federal Heights, CO, is filled with fear when 69-year-old veteran Bill Mussack is reported missing, gone without a trace; police act fast to uncover a diabolical killer with a heinous plot before the malicious murderer strikes again.
In early 1980, two eerily similar crimes occur 400 miles apart; they both leave young mother dead and an infant child stolen; years later, police unravel a plot so cold-blooded, it leaves everyone even seasoned homicide detectives in utter shock.
A burning car is found by the side of a highway on the same night a single mother of two is reported missing; the two events are related and connecting the dots leads investigators to a notorious criminal who has been hiding in plain sight.
Air Force veteran Michael Giles disappears along with his savings of $206,000 and detectives find a that Kwaneta Harris has been draining his accounts.
In 1994, Lake Orion, MI, is rocked by a murder; at first, the crime is a mystery -- but in a small town where everyone knows each other, rumors start flying. Police soon expose a strange and twisted plot that no one saw coming.
In Las Vegas, a beloved father of four is found dead in his car; he's been bound, gagged, and asphyxiated. Witnesses lead detectives to a local man named John Brian Ray, but this troubled man is just a pawn in the game of a criminal mastermind.
Three men die over a span of a dozen years, with no suspicion of wrongdoing and no files charged. But when a deadly car explosion rips through downtown Pensacola, FL, a new investigation begins; all suspicion points toward just one person.
In West Bloomfield, MI, a simple affair between two coworkers turns complex as the two lovers are willing to do anything, even commit murder, to protect their darkest secret.
Three women die of the same mysterious illness, and the hunt is on to prove their deaths were no accident; investigators don't realize they're being played for fools by a sinister killer lurking undetected.
When Samuel Johnson Jr. suddenly vanishes, investigators find themselves face-to-face with two sisters who know something; through a series of interrogations, they reveal an elaborate murder plot meticulously engineered by a puppeteer.
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