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  • Premiered: 
    March 15, 2018
    (Click date to see TV listings for that day)

  • Network: ID
  • Category: Series
  • Genre: Docudrama
  • Type: Live Action
  • Concept: 
  • Subject Matter: Crime
  • Tags:

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(That We Know Of)
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(That We Know Of)

Plot Synopsis

DIABOLICAL is a one-hour docuseries that tells the stories of shockingly devious masterminds, who use their wits and wiles to manipulate others, seduce them, and then try to get away with murder. On Monday, January 1, 2018 at 3pm ET/PT, Investigation Discovery premiered a single sneak-peek episode of DIABOLICAL, but the cable channel had no other episodes on its schedule at that time. In the sneak peek, "Mistress Roulette," Dr. Adam Frasch is living large with a wife and baby. His practice is booming, he loves to spend money on houses, exotic cars, and exotic dancers who become mistresses. Ultimately, the doctor discovers that sowing deceit and jealousy reaps serious consequences. Ten weeks later -- on Thursday, March 15 -- DIABOLICAL had its official series premiere, as Investigation Discovery debuted the "Lying for Love" episode. After a rocky first marriage, Tim Koile has a new bride and a fresh lease on life. But when temptress Cathy Cousin moves next door, the married woman wraps the devoted father around her finger, and has him satisfy her every whim -- no matter how diabolical.

On Tuesday, May 21, 2019 at 9pm ET/PT, Investigation Discovery premiered the second season of DIABOLICAL. In the season opener, "Mother of All Lies," Detective Scott Sanderson finds himself solving one of the strangest cases of his career in 2015. At its center are a newborn and her missing mother. Before long he'll uncover a diabolical scheme that will destroy the lives of everyone it touches.
Investigation Discovery premiered the Season 2 finale of DIABOLICAL on Tuesday, July 16, 2019 at 9pm ET/PT. In the season ender, "When All Else Fails," after her home is invaded and her husband murdered, Shaunna Dodd recounts her harrowing ordeal at gunpoint. But when investigators dig deeper, they uncover a tale of lies, infidelity, and shady characters who have wandered into the Washoe Valley.

Production & Distribution

  • Produced by Lion Television