Police investigators and forensics experts led by Thailand's deputy national police chief Surachate Hakparn (C) hold a press conference regarding the case of Sararat Rangsiwuthaporn, a woman accused of poisoning multiple victims with cyanide, at the Crime Suppression Division in Bangkok on June 30, 2023. LILLIAN SUWANRUMPHA/AFP via Getty Images

A Thai woman believed to be among the worst serial killers in the kingdom's history was convicted and sentenced to death Wednesday for poisoning a friend with cyanide, in the first of her 14 murder trials.

Sararat Rangsiwuthaporn, 36, an online gambling addict, is accused of swindling thousands of dollars from her victims before killing them with the chemical.

A court in Bangkok convicted her Wednesday for fatally poisoning her friend Siriporn Kanwong.

The two met up near Bangkok in April last year to release fish into the Mae Klong river as part of a Buddhist ritual.

Siriporn collapsed and died shortly afterwards and investigators found traces of cyanide in her body. Last year, police said they collected fingerprints and other evidence from Sararat's Toyota Forerunner.

Police were then able to link Sararat to previously unsolved cyanide poisonings going back as far as 2015, officers said.

"The court's decision is just," Siriporn's mother, Tongpin Kiatchanasiri, told reporters following the verdict. "I want to tell my daughter that I miss her deeply, and justice has been done for her today."

Police said Sararat funded her gambling addiction by borrowing money from her victims -- in one case as much as 300,000 baht (nearly $9,000) -- before killing them and stealing their jewelry and mobile phones.

She lured 15 people -- one of whom survived -- to take poisoned "herb capsules," they said.

Sararat faces 13 more separate murder trials, and has been charged with around 80 offenses in total.

Her ex-husband, Vitoon Rangsiwuthaporn -- a police lieutenant-colonel -- was given 16 months in prison and her former lawyer two years for complicity in Siriporn's killing, the lawyer for the victim's family said.

The couple, while divorced, had still been living together, the BBC reported. Police said Rangsiwuthaporn was likely involved in Sararat's alleged murder of an ex-boyfriend, Suthisak Poonkwan, the BBC reported. Police said that after she killed him, Rangsiwuthaporn picked her up in her car and helped her extorte money from Suthisak's friends.

Thailand has been the scene of several sordid and high-profile criminal cases.

Earlier this year, six foreigners were found dead in a luxury Bangkok hotel after a cyanide poisoning believed to be connected to debts worth millions of baht.

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