Thailand's 'Jack the Ripper' arrested again, months after early release

Thai police on Wednesday arrested a convicted serial killer in connection with another murder after his early release from jail for good behaviour, authorities confirmed.

Somkid Pumpuang was sentenced to life imprisonment in 2005 for the killing of five women believed to be involved in the sex and nightlife industry, leading the media to dub him Thailand's "Jack the Ripper".

Authorities considered him an "excellent prisoner" and released him in May this year, but he is now the chief suspect in the murder this week of a 51-year-old hotel worker in the country's northeast.

Rassami Mulichan was found dead in her home with adhesive tape around her neck and her ankles bound with a mobile phone charging cord, the Bangkok Post reported.

In 2005, Somkid's victims were either drowned or strangled before he stole their possessions.

Authorities distributed his photo under the heading "Most Wanted" and offered a 50,000 baht (S$2,200) reward for information leading to his capture.

On Wednesday, police released photos showed officers detaining the suspect on a train in the town of Pakchong in Nakhon Ratchasima province.

"Somkid Pumpuang was arrested thanks to information from the public," said Major General Puttipong Musikul from Khon Kaen police force.

Local media described how a fellow passenger on the train spotted the suspect wearing a cap and face mask and sent a photo to police.

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Thailand's corrections department said it was urgently reviewing its sentence reduction policies but also said it was operating at three times capacity with 370,000 inmates.

Thailand has one of the largest prison populations in the world and overcrowding remains a serious problem.

The number reached an all-time high earlier this year, according to a report this month from the International Federation for Human Rights and the Union for Civil Liberty.

Nearly 80 per cent are jailed for drug-related offences.