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#1 - Mistress Roulette
Season 1 Episode 1 - Aired 1/1/2018
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.
Director: N/A
Writer: N/A
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#2 - 'Til Death Do We Part
Season 1 Episode 3 - Aired 3/22/2018
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.
Director: N/A
Writer: N/A
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#3 - Who Lies Beneath
Season 1 Episode 4 - Aired 3/29/2018
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.
Director: N/A
Writer: N/A
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#4 - Best Of Friends
Season 1 Episode 5 - Aired 4/5/2018
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.
Director: N/A
Writer: N/A
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#5 - Mother Of All Murders
Season 1 Episode 6 - Aired 4/12/2018
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.
Director: N/A
Writer: N/A
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#6 - Family Or Foe
Season 1 Episode 7 - Aired 4/19/2018
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.
Director: N/A
Writer: N/A
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#7 - Accident Waiting To Happen
Season 1 Episode 8 - Aired 4/26/2018
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.
Director: N/A
Writer: N/A
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#8 - Weeping Widow
Season 1 Episode 9 - Aired 5/3/2018
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.
Director: N/A
Writer: Rebecca Ratliff Cameron
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#9 - Living Off The Dead
Season 1 Episode 10 - Aired 5/10/2018
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.
Director: N/A
Writer: N/A
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#10 - Mother Of All Lies
Season 2 Episode 1 - Aired 5/21/2019
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.
Director: N/A
Writer: N/A
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#11 - Who Needs Enemies
Season 2 Episode 2 - Aired 5/27/2019
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.
Director: N/A
Writer: N/A
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#12 - Someone's Lying
Season 2 Episode 3 - Aired 5/28/2019
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.
Director: N/A
Writer: N/A
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#13 - Recording Evil
Season 2 Episode 4 - Aired 6/4/2019
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.
Director: N/A
Writer: N/A
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#14 - Queen Of Deception
Season 2 Episode 5 - Aired 6/11/2019
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.
Director: N/A
Writer: N/A
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#15 - Control Freak
Season 2 Episode 6 - Aired 6/18/2019
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.
Director: N/A
Writer: N/A
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#16 - The Rich Get Richer
Season 2 Episode 7 - Aired 6/25/2019
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.
Director: N/A
Writer: N/A
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#17 - A Life Of Lies
Season 2 Episode 8 - Aired 7/2/2019
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.
Director: N/A
Writer: N/A
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#18 - Murder Is No Accident
Season 2 Episode 9 - Aired 7/9/2019
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.
Director: N/A
Writer: N/A
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#19 - When All Else Fails
Season 2 Episode 10 - Aired 7/16/2019
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.
Director: N/A
Writer: N/A
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#20 - Daddy's Little Nightmare
Season 3 Episode 1 - Aired 3/10/2020
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.
Director: N/A
Writer: N/A
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#21 - Hands That Rob the Cradle
Season 3 Episode 2 - Aired 3/17/2020
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.
Director: N/A
Writer: N/A
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#22 - Masking Evil
Season 3 Episode 3 - Aired 3/24/2020
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.
Director: N/A
Writer: N/A
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#23 - Lie For Me
Season 3 Episode 4 - Aired 3/31/2020
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.
Director: N/A
Writer: N/A
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#24 - Sins of a Mother
Season 3 Episode 5 - Aired 4/7/2020
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.
Director: N/A
Writer: N/A
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#25 - Teach Me To Kill
Season 3 Episode 6 - Aired 4/14/2020
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.
Director: N/A
Writer: N/A
The Worst Episodes of Diabolical
Every episode of Diabolical ranked from worst to best. Explore the Worst Episodes of Diabolical!
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...
Genres:CrimeDocumentaryFamilyReality
Network:Investigation Discovery
Worst Episodes Summary
"Mistress Roulette" is the worst rated episode of "Diabolical". It scored N/A/10 based on 0 votes. Directed by N/A and written by N/A, it aired on 1/1/2018. This episode scored NaN points lower than the second lowest rated, "'Til Death Do We Part".