The Black Index

The Black Index 🔎 Unsolved mysteries • True Crime • Cold Cases • Dark History
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07/29/2026

The Tylenol Murders (1982) | America's Most Infamous Unsolved Crime

In September 1982, seven innocent people in the Chicago area died after taking Extra-Strength Tylenol capsules that had been secretly laced with cyanide. The victims had no connection to one another, making the case one of the most terrifying and mysterious crimes in American history.

The poisonings sparked nationwide panic, forced Johnson & Johnson to recall more than 31 million bottles of Tylenol, and forever changed how medicines are packaged with tamper-evident safety seals. Despite decades of investigation, thousands of leads, and advances in forensic science, the person responsible has never been identified.

Watch this true crime story unfold through real historical photographs and documented events from one of America's most shocking unsolved cases.

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#1982

07/28/2026

The Keddie Cabin Murders remain one of America's most chilling unsolved cases.

On April 11, 1981, four people were murdered inside Cabin 28 in Keddie, California. Three children survived in a separate bedroom, while 12-year-old Tina Sharp was abducted. Her remains were discovered three years later near Feather Falls.

Despite decades of investigations and new evidence, no one has ever been charged.

This Short is based on publicly documented information from the Plumas County Sheriff's Office and historical reporting.

07/27/2026

🕵️ The Yogurt Shop Murders: One of America's Most Haunting Unsolved Cases

On December 6, 1991, four teenage girls finished their shift at a yogurt shop in Austin, Texas. Hours later, firefighters responding to a late-night fire made a devastating discovery that would shock the nation.

Years later, four men were arrested, but their convictions were eventually overturned after new DNA evidence raised serious doubts about the case. More than 30 years later, the murders remain officially unsolved, and investigators continue searching for answers.

Watch this short documentary to learn the verified facts behind one of America's most chilling unsolved crimes.

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07/26/2026

The Setagaya Family Murders | Japan's Most Chilling Unsolved Crime

On December 30, 2000, the Miyazawa family of four was brutally murdered inside their home in Tokyo, Japan. What makes this case so disturbing isn't just the crime—it's what the killer did afterward.

Investigators believe the murderer stayed inside the house for hours, ate food, used the family's computer, and left behind an extraordinary amount of forensic evidence, including fingerprints, DNA, clothing, and personal belongings. Despite thousands of investigators and decades of work, no suspect has ever been identified.

Disclaimer: The thumbnail/cover image is an AI reconstruction inspired by publicly available evidence and is not an authentic police photograph. All information presented in this video is based on publicly documented sources and is intended for educational and documentary purposes.

If you enjoy real unsolved mysteries and true crime documentaries, subscribe for more cases backed by authentic evidence.

07/25/2026

On October 24, 1961, Joan Risch vanished from her home in Lincoln, Massachusetts, leaving behind only bloodstains and unanswered questions.

Despite an extensive investigation, no body was ever found, no suspect was identified, and the case remains unsolved more than 60 years later.

Disclaimer: The image of the victim shown in this video is an artist's sketch/recreation and not an authentic photograph of Joan Risch. It is used for illustrative purposes only.

What really happened to Joan Risch?

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07/24/2026

The Sandra Cantu Case | True Crime Short

On March 27, 2009, 8-year-old Sandra Cantu disappeared from her neighborhood in Tracy, California. What began as a missing child investigation quickly became one of the most shocking true crime cases in the state's history.

⚠️ This video is for educational and documentary purposes only. All information is based on publicly available sources.

07/21/2026

In the spring of 1922, on a remote farmstead in Bavaria known as Hinterkaifeck, a series of unsettling events began to unfold. Strange footprints appeared in the snow, mysterious sounds echoed from the attic, and the family reported signs that someone was watching them.

Days later, six people living on the farm were found brutally murdered. But the mystery only deepened when investigators discovered evidence suggesting the killer may have stayed at the property afterward—feeding the animals and living inside the house among the victims.

More than a century later, the Hinterkaifeck murders remain one of Germany’s most haunting unsolved cases. The killer was never found… and the truth remains hidden.

But what do you think happened at Hinterkaifeck? Was it someone the family knew, or a stranger hiding in the shadows?

07/20/2026

A well-dressed man was found dead on Somerton Beach in 1948.

More than 75 years later, this mysterious case still has no definitive answer.

What do you think really happened?

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