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‘Aem Cyanide’ sentenced to life for murder of police officer

‘Aem Cyanide’ sentenced to life for murder of police officer

NAKHON PAHOM: The Criminal Court has sentenced Sararat “Aem Cyanide” Rangsiwuthaporn to life imprisonment for poisoning a police officer with cyanide in Nakhon Pathom province.

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By Bangkok Post

Saturday 21 February 2026 09:30 AM


Police escort Sararat Rangsiwuthaporn to the Criminal Court on Apr 26, 2023, a day after her arrest. Photo: Police

Police escort Sararat Rangsiwuthaporn to the Criminal Court on Apr 26, 2023, a day after her arrest. Photo: Police

Sararat, 39, is suspected of killing 14 other people with cyanide and has already been found guilty of one murder, reports the Bangkok Post.

The court in Bangkok ruled that she intentionally poisoned Pol Maj Nipa Sangchan - known as “Inspector Pu” - by mixing cyanide into her food or drink near Phra Pathom Chedi on Apr 1, 2023. Pol Maj Nipa died from acute heart failure precipitated by cyanide.

Judges said Sararat acted with intent to kill to obtain financial gain from earlier fraud committed against the officer. The court initially imposed the death sentence but commuted it to life imprisonment after the defendant confessed and gave useful testimony.

On Nov 20, 2024, the Criminal Court sentenced Sararat to death for poisoning and killing her friend, Siriporn Khanwong, with potassium cyanide. The court found she had placed potassium cyanide in Siriporn’s consumables, left her to die and stole her belongings. Fatal cyanide levels were later detected in the victim’s organs.

Sararat faced charges of premeditated murder for the purpose of theft and an attempt to cover up the crime. She denied the charges.

Investigators suspect Sararat administered potassium cyanide to 14 people between 2015 and 2023, allegedly to avoid debts or steal valuables. They linked the serial cyanide killer to heavy online gambling, large bank transactions and attempts to hide evidence.

The Kanchanaburi native, dubbed “Aem Cyanide” after police found traces of cyanide in the victims’ bodies, was arrested on Apr 25, 2023, and she was pregnant when caught. Police wrapped up their investigation into her criminal cases in June 2023, about the time she miscarried during the fifth or sixth month of her pregnancy.

In Thailand, the purchase of a certain amount of deadly cyanide is technically not illegal. The law requires a buyer’s permit only when they buy a substantial amount.