After she became popular thanks to YouTube and The Voice, rising pop star Christina Grimmie was well on her way to worldwide fame — then an obsessed fan named Kevin James Loibl shot her to death after a concert in 2016.

Sarra Gilbert's vicious murder of her mother, Mari Gilbert, came five years after her sister Shannan was found dead — possibly at the hands of the Long Island Serial Killer.

For over 20 years, Jeremy Dewitte has been impersonating police officers in Central Florida — and committing countless other crimes all the while.

Mari Gilbert became an advocate for murder victims after her daughter Shannan's disappearance led to the discovery of the Gilgo Beach Murders — then Mari was killed herself by her other daughter Sarra.

On June 12, 1994, Nicole Brown Simpson was murdered at her Los Angeles home — and her ex-husband O.J. Simpson soon became the prime suspect.

Authorities believe that Naya Rivera used the last of her energy to push her four-year-old son Josey to safety on their boat before disappearing beneath the surface of California's Lake Piru on July 8, 2020.

A friend of Nicole Brown Simpson who fatefully visited her Brentwood home on the day of her murder, Ron Goldman is one of the most famous innocent bystanders in modern history.

On December 15, 2017, billionaire couple Barry and Honey Sherman were found murdered in their Toronto home — and no one knows who killed them.

On August 2, 2006, a lawyer named Robert Wone was assaulted and murdered while staying with friends in Washington, D.C. — and while his friends were charged with tampering with the crime scene, his killer has never been caught.

In 2014, YouTuber Kenny Veach set out to explore a mysterious M-shaped cave he had discovered near Nevada's Nellis Air Force Base in the Mojave Desert — then mysteriously vanished, never to be seen again.

A convicted pedophile who lived near JonBenét Ramsey at the time of her 1996 killing, Gary Oliva had a deep obsession with the six-year-old pageant star — and claimed responsibility for her murder in a series of prison letters.