April 2023.
At a quiet river in Samut Songkhram, two friends release fish into the current, a Buddhist ritual meant to bring life and merit. But moments later, forty-four-year-old Siriporn Kanwong collapses. By the time medics arrive, she is gone.

At first, it looks like fate. A tragic heart attack during prayer. But the autopsy finds cyanide in her blood. And the bottles of poison discovered in her friend’s car reveal something darker.

Her name was Sararat Rangsiwuthaporn. But the world would come to know her as Am Cyanide.

Over nearly a decade, police tied her to fourteen deaths—friends, lovers, even a police officer—people who trusted her, lent her money, or stood too close. She borrowed. She smiled. And when the debts came due, she offered something else: a drink, a capsule, a bite of food.

In November 2024, a Thai court sentenced her to death in the first of fourteen trials. Pregnant when she was arrested, Am Cyanide shattered every expectation of what a killer in Thailand could look like.

This is her story—the betrayals, the poison, and the cultural shock that still lingers.

Our telling comes from reporting in The Bangkok Post, Thai PBS, ABC News, CBS News, People, The Guardian, The Sun, the New York Post, and archives gathered on Wikipedia’s Am Cyanide case.

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