Sararat Rangsiwuthaporn

The Am Cyanide case covers fourteen suspected serial murders by cyanide poisoning in Thailand from 2015 and 2023. It is so-called by the media after the nickname of the accused, Sararat Rangsiwuthaporn , and her modus operandi. Following this, Sararat was arrested on 20 April and was denied bail. In the aftermath, families of previous victims, almost all of whom had personal connections to Sararat but whose deaths had been ruled to be of natural causes, came forward with their suspicions.

The investigation linked Sararat to fourteen suspected murders and one non-fatal poisoning. Authorities estimated that she had obtained more than THB 5,000,000 (€130,000) from the victims before poisoning them. The case was instituted on 18 July 2023, and Sararat's ex-husband, Police Lieutenant Colonel Withoon Rangsiwuthaporn, The trial's first taking-of-evidence session took place on 4 July 2024.

In November 2024, Sararat was found guilty of murdering Siriporn Khanwong in the first of 14 trials, and sentenced to death. Meanwhile, her husband was sentenced to 16 months in prison for hiding evidence and helping Sararat evade arrest.

In February 2026, Sararat received a second death sentence for the April 2023 murder of Police Major Nipa Saenchan.