Sararat Rangsiwuthaporn

Sararat Rangsiwuthaporn (สรารัตน์ รังสิวุฒาภรณ์), dubbed Am Cyanide by the media (after her nickname and modus operandi), is a Thai alleged serial killer accused of murdering fourteen people by cyanide poisoning between 2015 and 2023.

The case came to public attention in April 2023 following the death of Siriporn Khanwong, a friend of Sararat's. 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 ensuing investigation linked Sararat to fourteen suspected murders, plus one poisoning whose victim survived. The victims were friends and acquaintances whom Sararat either had borrowed money from or killed to steal their possessions. Police said that she was apparently motivated by an online gambling addiction.

The police forwarded over 75 charges against Sararat to the public prosecutor on 30 June. They included premeditated murder, attempted murder, theft causing death, and forgery. The case was instituted on 18 July 2023, with Sararat's ex-husband (a police officer) and her lawyer also accused of helping Sararat conceal evidence. The trial's first taking-of-evidence session took place on 4 July 2024.