Killer Theory

Serial Killers and Unsolved Murders Database

Dive deep into the dark mysteries of infamous serial killers and unsolved cold cases to unravel the theories and hidden truths behind them.

What You’ll Find Here

Famous Cases

Lesser Known​

International

By State

About Us

KillerTheory.com is a chilling deep dive into the darkest corners of true crime.

Dedicated to unraveling the mysteries behind infamous serial killers and unsolved cold cases, with in-depth profiles, gripping narratives, and thought-provoking theories, we offer our readers a chance to delve into the psychology and minds of the killers, uncover long overlooked evidence, and ponder at the unanswered questions that still haunt these cases today.

Whether you’re a true crime enthusiast or a seeker of justice for the forgotten, KillerTheory.com is your guide to the shadows where truth and terror collide.

*murders per day in usa
(as of 2022)
%
get solved
%
remain unsolved
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Top Five Cases ~ KillerTheory.com
NUMBER ONE

The Zodiac Killer

The Zodiac Killer taunted police and media with cryptic letters and ciphers sent to newspapers, claiming to have killed 37 people, although only five confirmed murders are linked to him. Despite intense investigations, the killer’s identity remains unknown.

NUMBER TWO

The Texarkana Moonlight Murders

This case involves a series of attacks on couples parked in secluded areas. The assailant, dubbed the “Phantom Killer,” was responsible for at least five murders and several injuries.

NUMBER THREE

The Chicago Tylenol Murders

Seven people died after taking Tylenol capsules laced with potassium cyanide. The tampering led to nationwide panic and changed the way over-the-counter drugs were packaged.

NUMBER FOUR

The Long Island Serial Killer

The Long Island Serial Killer is thought to have killed between 10 to 16 people, primarily sex workers whose remains were found along Ocean Parkway on Long Island.

NUMBER FIVE

The Cleveland Torso Murderer

Also known as the “Mad Butcher of Kingsbury Run,” this unknown assailant was responsible for at least 12 grisly dismemberment murders, with victims often left decapitated.

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