Harvey Marcelin had already been convicted of murder twice — spending over 50 years behind bars across two separate sentences. Each time he was released, he killed again. In 2022 at 83 years old, investigators received a tip about a shopping cart abandoned on a Brooklyn street. What they found inside led them straight to Marcelin — and what surveillance cameras had already captured was unlike anything investigators said they had seen before. This is the case of Harvey Marcelin.

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China Arnold was a mother from Dayton, Ohio. In August 2005 she brought her 28-day-old daughter Paris to hospital — unconscious. Doctors couldn’t explain what had happened. Then the coroner’s findings pointed to something so disturbing it had barely been seen before in a criminal case. This is the case of China Arnold.

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Anggy Diaz moved to America from Nicaragua dreaming of a better life. She was working two jobs to pay for her mother’s cancer treatment back home. Three months after her wedding she was found dead in the home she shared with her husband — the scene described by the sheriff as one of the most gruesome he had ever seen. This is the case of Anggy Diaz.

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In November 2020 something happened in a Houston apartment that nobody reported. Nobody called for help. Nobody came. For almost a year three young boys were left completely alone inside — until the eldest finally picked up the phone in October 2021 and told police what had been in that apartment with them the entire time. This is the case of Kendrick Lee.

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In September 2024 Paul Scott tried to break up a fight. He walked away thinking nothing of it. Nine months later a mother arrived at his door at 3am with her son and daughter — armed with knives — and her daughter filmed the whole thing. This is the case of Paul Scott.

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At her own gender reveal Nicole Blain stormed off clutching a pink knife after finding out she was having a girl. Nineteen days after her daughter Thea was born, she was dead. Blain blamed another child for the injuries. A pathologist ruled that was impossible. This is the case of Nicole Blain.

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Cheryl Christensen’s disabled son was found dead on her bathroom floor. She had been his sole carer for over thirty years. What she told police about his final days was disturbing enough — but years later, just weeks before she was due in court, something happened that nobody could have predicted. This is the case of Cheryl Christensen.

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Austin Metcalf and his twin brother arrived at a school track meet together on April 2nd 2025. Only one of them went home. A four minute argument over a tent ended with Austin stabbed through the heart — his last words were "I've been stabbed." This is the case of Austin Metcalf.

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Preston Davey was thirteen months old when he was placed with two men for adoption in Blackpool. Everyone who met him described him as a happy, smiley little boy. Four months later he was dead. The lead detective called it the most harrowing case of his career. This is the murder of baby Preston Davey.

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He had a Cambridge degree, a respected lecturing job, and a Twitter feed full of awkward selfies and dinosaur photos. To anyone who knew him, Matthew Falder seemed completely harmless.
But behind that ordinary appearance, he was secretly operating on the dark web under the name “666devil”.

What investigators eventually uncovered was so disturbing it took authorities from five countries four years to piece together the full extent of his crimes.
When they finally arrested him, seasoned detectives said they had never encountered anything like it.

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Sonia Exelby was struggling when she posted online looking for someone to torture and kill her. A man in Florida answered. She flew from England to meet him, handing over $1,200 before he led her to a remote property. A week later, she was found dead in a shallow grave.This is the case of Sonia Exelby.

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