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Interviews with key people connected to the case in which two 12-year-olds stabbed their friend 19 times and left her for dead in an effort to appease the mysterious fictional character known as Slender Man.

After a popular local musician is found dead, covert police surveillance uncovers horrific murders in Colorado and exposes a killer.

Interviews with Amanda Berry, Gina DeJesus, and Michelle Knight, who made headlines when they escaped their Cleveland kidnapper's home, after a decade of captivity.

13 children were held captive by their parents in a survival story like you’ve never seen. Now, hear from the family for the first time.

Behind the glitz and glam of one of the sexiest shows in entertainment, an FBI investigation revealed Chippendales founder Steve Banerjee was the mastermind behind multiple murder-for-hire plots.

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Daniel Wozniak was a community theater actor in California when he was arrested for the murders of Sam Herr, a war veteran, and Julie Kibuishi, a college student and dancer, in May 2010.

New details are revealed in the case of a missing Colorado mom who secretly ran an expensive escort business.

For over 26 years, authorities tried to locate Jodi Huisentruit, a 27-year-old anchorwoman who vanished in Mason City, Iowa. Now “20/20” explores surprising new leads in the case.

For three decades, Leo Schofield has been serving life in prison since his wife’s brutal stabbing. The “20/20” season 45 premiere poses the question: is Leo in prison for the crime of another man?

A mysterious drug overdose kills new mom Christina Harris. Would she leave behind a crucial clue that actually points to a killer?

An open marriage, a secret affair, and a sinister plot for murder.

A special edition of "20/20" looks into the shootings in Georgia and the rise in hate crimes against the Asian American Pacific Islander community.

Police launch a 38-day nationwide manhunt to find a 15-year-old Tennessee student taken by her teacher.

Thirty years after she had learned that she was switched at birth, Kimberly Mays reveals the details about her tough childhood and her struggle with her identity; interviews with Kimberly's biological siblings, and her mother, Regina Twigg;

Michigan mother of three Sharee Miller sat in the center of a complicated love triangle. She used sex, deception and the internet to pit her lover, Jerry Cassaday against her husband Bruce Miller.

New details about the case of 17-year-old Brittanee Drexel, whose disappearance while on spring break stumped police for years.

Was it a case of self-defense or murder after a mom of two shot and killed her partner?

The investigation of the Gilgo Beach murders, featuring interviews with family members of the victims and key players in the case - including Suffolk County Police Commissioner Rodney Harrison and Suffolk County Defense Attorney Ray Tierney.

An investigation on Christa Worthington's murder in 2002 and the man accused. Christa was stabbed to death with her daughter at her side, and new details on the crime raise questions as to whether the right person was convicted for the murder.

A man convicted of murder claims new DNA analysis exonerates him of the murder of his former girlfriend's parents; interviews with those close to the case, including the original investigators, and former London detectives who believe he is guilty.

How Siegfried Fischbacher and Roy Horn rose to fame, survived the tiger accident and changed Las Vegas forever.

When a University of Illinois scholar goes missing, a suspect's girlfriend works with the FBI to go under cover and secretly record a conversation that ultimately cracks the case.

A woman's seemingly obsessive and threatening messages to an ex precede a stunning twist.