Am Cyanide: Sararat Rangsiwuthaporn, Siriporn “Koy” Kanwong, and Thailand’s Cyanide Serial Killer Case | Revisited

Am Cyanide, Sararat Rangsiwuthaporn, and the murder of Siriporn “Koy” Kanwong became one of the biggest Thailand true crime stories in recent memory after Koy died during a merit-making ritual at the Mae Klong River on April 14, 2023. In this episode of Shadows of Siam, we follow the cyanide evidence, the missing valuables, the widening investigation, and the courtroom verdict that turned one death into a national reckoning.This episode traces how Koy’s death led investigators to a much larger pattern of suspected poisonings, why Thai police believed money and trust sat at the center of the case, and how the first major trial ended. On November 20, 2024, a Bangkok court convicted Sararat in Koy’s murder case and sentenced her to death in the first of multiple murder trials tied to the wider cyanide investigation.As always, this story stays anchored to court reporting, verified news coverage, and the public record. Where rumor, online chatter, and public speculation enter the story, they are clearly separated from what can actually be proved. At the center of all of it is Koy, a woman whose life should never be reduced to a headline.SourcesBangkok Post — Cyanide killer gets death sentencehttps://www.bangkokpost.com/thailand/general/2905536/cyanide-killer-gets-death-sentenceKhaosod English — Thai Court Hands Down Death Sentence in High-Profile Cyanide Murder Casehttps://www.khaosodenglish.com/news/crimecourtscalamity/2024/11/20/thai-court-hands-down-death-sentence-in-high-profile-cyanide-murder-case/The Guardian — Thai woman sentenced to death for cyanide poisoning in first of 14 murder trialshttps://www.theguardian.com/world/2024/nov/20/thai-woman-sentenced-to-death-in-first-of-14-trialsCBS News — Woman linked to 14 cyanide murders is convicted and sentenced to death in Thailandhttps://www.cbsnews.com/news/woman-cyanide-murders-convicted-sentenced-to-death-thailand/ABC News Australia — Thailand's worst suspected serial killer 'Am Cyanide' given death penalty over cyanide killinghttps://www.abc.net.au/news/2024-11-21/thailand-cyanide-serial-killer-sentenced-to-death/104627508#ShadowsOfSiam #AmCyanide #ThailandTrueCrime #SararatRangsiwuthaporn