The Tommy gun was intended to be a military weapon, but as organized crime skyrocketed during Prohibition and the Great Depression, it soon became the firearm of choice for gangsters like Al Capone.

Erin Corwin thought her lover Christopher Lee was going to propose to her on June 28, 2014 — but instead, he strangled her and threw her down a mine shaft near Joshua Tree National Park.

Rich plantation owners in the 1880s were so desperate to combat the rats eating their sugarcane that they brought the mongoose to Hawaii — and the government still can't get rid of them to this day.

From murderers being captured to missing children being reunited with their parents, explore some of the most baffling cases that were solved after Unsolved Mysteries aired episodes about them.

Samantha Koenig was just 18 years old when serial killer Israel Keyes kidnapped and murdered her in Anchorage, Alaska — before sewing her eyelids open for a chilling "proof of life" photo.

When Scott Amedure confessed his crush on his straight friend Jonathan Schmitz while appearing on the daytime talk show, a stunned Schmitz seemed to laugh it off — but three days later, he shot Amedure dead.

Cleo Rose Elliott's mother Katharine Ross says she was verbally abusive even as a child — then developed violent tendencies by the time she reached her teens.

After Lauren Dumolo vanished from her neighborhood in Cape Coral, Florida, her purse and shoes were found in a nearby park where she claimed she was being followed just a few days before.

Patricia Kennealy-Morrison famously said that she and Jim Morrison were wed in June 1970 during a Celtic handfasting ceremony — where they drank each other’s blood.

Half a decade before Nirvana released their first album, Tina Bell and her band Bam Bam pioneered the combination of punk and heavy rock that would come to define grunge music.

Brianna Alexandra Maitland suddenly disappeared without a trace in March 2004 — and though everyone from a drug gang to a serial killer has been suspected, authorities are still no closer to figuring out what happened.