Every season of Diabolical ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Diabolical!

Mistress Roulette

Lying For Love

'Til Death Do We Part

Who Lies Beneath

Best Of Friends

Mother Of All Murders

Family Or Foe

Accident Waiting To Happen

Weeping Widow

Living Off The Dead

Mother Of All Lies

Who Needs Enemies

Someone's Lying

Recording Evil

Queen Of Deception

Control Freak

The Rich Get Richer

A Life Of Lies

Murder Is No Accident

When All Else Fails

Daddy's Little Nightmare

Hands That Rob the Cradle

Masking Evil

Lie For Me

Sins of a Mother

Teach Me To Kill

Devil Wears False Eyelashes

Caught In the Cover-Up

Killer Track Record

Evil Sister Act

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.

The Best Seasons of Diabolical

The Best Seasons of Diabolical

Season 1

Season 2

Season 3