Police arrested paroled serial killer Somkid Pumpuang on a Surin-Bangkok train at Pak Chong station on Wednesday morning, for the murder of a woman in Khon Kaen province.
Police found Somkid, 55, asleep and sitting alone next to a window. He was wearing a cap, his lower faced covered by a mask, and had covered himself with a jacket.
According to Thai media reports he was identified and reported to police by two students, who noticed a mark on his forehead and compared it with police photos using their phones.
Police said Somkid bought a ticket at Buri Ram train station. He did not resist arrest. Police confirmed they received a call and a video clip of Somkid from a train passenger.
Somkid, dubbed "Jack the Ripper of Thailand", is suspected of murdering Ratsami Mulichan, 51, at her house in Khon Kaen on Sunday. The dead woman's son said had earlier told him her new lover was a lawyer and they got to know each other via Facebook.
Police believe Ratsami was Somkid's sixth victim. He was sentenced to life imprisonment for murdering five women in 2005. They were singers and masseuses. He was arrested in the same year.
Somkid was paroled and let free on May 17 this year. The Corrections Department said he was a "model prisoner".
