Patricia Kopta was a Pittsburgh street preacher known as "The Sparrow" who mysteriously vanished in 1992.

A white tiger believed to have Down syndrome, Kenny went viral online as the so-called "ugliest tiger in the world" — but the truth was much more heartbreaking.

Konerak Sinthasomphone was just 14 years old when he managed to escape from Dahmer's lair in 1991 — but unwitting police officers handed him right back over to Dahmer, sending him to his brutal death.

A pair of studies offering the most in-depth look into the lives of Ice Age hunter-gatherers has revealed at least eight previously unknown groups of early Europeans.

Since they were first described in 1910, fewer than 130 sightings have ever been made of this mysterious deep-sea creature.

The wild boars have adapted to Canada's harsh winters and destroyed native plant and animal species — and it seems like there's no stopping them.

A few days after murdering Lauren Giddings, Stephen McDaniel posed as a concerned neighbor on the local news — but his charade crumbled when he learned from the reporter that her body had just been found.

In 1985, a drug smuggler hurled a duffel bag of cocaine out of a plane and into a Georgia forest, where it was found by a black bear who was aptly nicknamed "Pablo Escobear."

No one batted an eye when Randy Roth's second wife fell off a cliff in 1981, but the death of his fourth wife in 1991 — along with the large insurance policy he had on her life — aroused suspicion.

Hirohito Shibuya and his ex-wife, Chiaki, allegedly told the girl that she would be abducted by aliens if she did not enter into a relationship with them.