Serial Poisoner Am Cyanide Sentenced to Death in Eighth Case
Am Cyanide, 39, was sentenced to death for poisoning Jantharat, a woman who died after meeting her in Phetchaburi province in August 2022, bringing her total to three death sentences across eight cases.
BANGKOK — September 22, 2026. The Criminal Court has sentenced 'Am Cyanide' to death in her eighth poisoning case, finding her guilty of premeditated murder in the death of Jantharat 'Jum' in Phetchaburi province.
Today's ruling brings Am's tally to three death sentences, two life sentences and three acquittals across the eight cases decided so far. Before today, seven of her cases had been decided, resulting in two death sentences, two life sentences and three acquittals. All rulings remain subject to appeal.
The court also ordered Am, 39, to pay 60,000 baht in compensation to the victim's husband, plus 5% annual interest from August 15, 2022 until payment is complete.
The judgment was read today in courtroom 712 at the Criminal Court on Ratchadaphisek Road in Bangkok, in black case number A 856/2568. Prosecutors had charged Am with premeditated murder for financial gain, concealing another offence or avoiding punishment for another offence, and contaminating food, medicine or other consumer products in a way that caused death.
How Jantharat died Jantharat, 43, met Am at a petrol station near her home in Phetchaburi on August 15, 2022. After returning home, her husband found her unconscious and took her to Cha-am Hospital, where she later died.
The two knew each other through a joint money-lending investment. Jantharat had transferred 70,000 baht to Am for the venture and had separately lent her 26,800 baht.
Cyanide purchase and the meeting The court found that Am had ordered a container of cyanide on August 9, 2022. She then arranged to meet Jantharat on August 15, saying she would return the investment money with interest and bring medicine for lingering COVID-19 symptoms.
Doctors found unusually high acid levels in Jantharat's liver, caused by inflammation, but could not initially identify the cause. A forensic expert told the court that her symptoms were consistent with severe cyanide poisoning, which deprives the body of oxygen and affects the heart and brain.
Phone records and testimony Police examined Jantharat's phone and found messages about the investment, records of a 26,800-baht transfer to Am, and an audio recording of the pair arranging to meet. The court heard that Am had initially proposed meeting on August 12, but postponed it because that day was a holiday and because Jantharat's husband and child were at home. The meeting was moved to a petrol station to avoid any witnesses, and Am also said she would provide medicine.
Jantharat's supervisor testified that she had generally been healthy. Although she had previously had COVID-19, she had not required hospital treatment and had only a lingering cough.
Court's ruling There were no eyewitnesses to the meeting or to any alleged administration of cyanide. However, the court said the evidence was sufficient beyond reasonable doubt, noting similarities with alleged conduct in Am's other cases, in which victims met her and were given food, drinks or medicine before falling ill.
