Lisa Renée Irwin went missing from her home in Kansas City, Missouri on the night of October 3, 2011, just hours after her mother put her to bed.

In June 2013, 19-year-old Maureen Leianuhea "Anu" Kelly went missing while camping with friends in a remote part of the Pacific Northwest, wearing nothing but a fanny pack.

With 103 confirmed kills, Charles Benjamin Mawhinney holds the record for most enemies taken down by a sniper in the history of the U.S. Marine Corps.

David Dahmer changed his name and chose to live in anonymity after the gruesome murders of his older brother Jeffrey came to light in 1991.

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.

On October 30, 1982, Dominique Dunne was brutally strangled to death by John Thomas Sweeney. He only served three and a half years for the crime.

Jeffrey Dahmer's mother struggled with mental illness while raising her son and never recovered from the guilt once his crimes came to light.

A child singer and dancer, Esther Lee Jones inspired Paramount to create the cartoon character Betty Boop in 1930 — but she never received any credit or royalties.

For thousands of years, accused criminals were subjected to being pressed or crushed to death, most famously during the Salem Witch Trials of 1692.

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.

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.

On the morning of February 27, 2012, T.J. Lane opened fire inside the cafeteria at Chardon High School, killing three students and wounding three others — while wearing a sweatshirt emblazoned with the word "killer."