Somkid Pumpuang

Six days after the final murder, Pumpuang was arrested while leading a young woman to a hotel in Chaiyaphum, where officers from the Crime Suppression Division found a cellphone stolen from the final victim.[3] After linking all five cases back to him, he was charged with five counts of murder and theft; the prosecution sought the death sentence for three of the murders. However, Pumpuang pleaded guilty to four of them (with the exception of Amatanirand), which resulted in an automatic life sentence, coupled with the remaining two life sentences which were sought.[1]

Following multiple grants of clemency over the years, Pumpuang's sentence was eventually reduced to 13 years imprisonment, scheduling his release date for 2019. During his imprisonment, he was described as a model inmate, which contributed significantly to the reduction of his sentence.[3]

On May 17, 2019, Pumpuang was released from the Nong Khai Provincial Prison and shortly after began dating 51-year-old Rassamee Mulichan, a housekeeper at a local hotel. On December 15 of that year, the couple's neighbors reported that they had apparently been arguing until the evening, when everything suddenly went quiet.[1] After she did not come out of the apartment to leave for work on the following morning, the neighbor called out for Rassamee, but received no response. He then opened the door and entered the household, where he found her body stuffed under the bed. Rassamee had been wrapped up in a blanket and transparent tape, with the former also being tied around her neck, with a cellphone charger tied around her ankle. The neighbor called out for Pumpuang, but again received no response.[1]

At the subsequent autopsy, coroners determined the cause of death to be suffocation, and a police investigation team was dispatched to interrogate witnesses. After being presented with photographs of multiple suspects, the witnesses identified the man they last saw leaving the house as Pumpuang, which was further reinforced by other evidence found at the crime scene itself.[1]

Four days later, authorities at the Pak Chong Provincial Police Station received a tip-off from a citizen who claimed that his girlfriend had seen a man resembling Pumpuang on a train. Soon after, detectives surrounded the Pak Chong Railway Station, and after the train stopped, they raided the second carriage and located Pumpuang, who was wearing a mask covering his nose and mouth to prevent possible identification. He did not resist his arrest and was brought to the local police station for interrogation.[4]

During interrogation, Pumpuang testified that on the day before the murder, he had taken Rasmee's motorcycle and driven to the Khon Kaen Hospital before safely returning it.[5] This act supposedly angered her and caused them to quarrel, which eventually resulted in him manually strangling her until she fainted. He then took out a wire and continued strangling her until she was dead. After this, Pumpuang took out the transparent tape and wrapped it around her neck, tied the phone charged to her feet, stowed the body under the mattress, and fled the residence.[1]

Eventually, Pumpuang was charged with the murder, convicted, and sentenced to death. His release and ability to commit a new crime sparked a debate about the royal pardons and the usage of the death penalty in the country.[6] The Director-General of the Department of Corrections, Naratch Sawetanan, also announced that a review would be conducted on how examinations for mentally-ill inmates are conducted, despite the fact that Pumpuang himself has never been diagnosed with any such illness.[5] The couple who reported the tip that led to the killer's arrest were later given awards for their bravery, as well as 80,000 baht.[5]