PATHUM THANI: Two language instructors, one American and one British, were found dead inside an apartment unit in the Rangsit area on Saturday morning.
Police said investigators were baffled by the circumstance of the deaths.
Charlie Milsom, a 35-year-old Briton, and Jonathan Louis, a 40-year-old American, were found sitting on chairs, with vomit on their bodies. They had likely been dead for eight to 10 hours, police said.
There were no signs of a struggle inside the room. Next to them was a medicine packet with Milsom's name on it, along with four bottles of a drug rehabilitation treatment, which have been recovered for testing.
(story continues below)
Photo from FM.91 Trafficpro
Louis's wife Thamaporn Apison, 44, told police that she had been living with him for about 14 years.
Ms Thamaporn, who works at the Ministry of Science and Technology, said her husband was working at a tutorial school in the Future Park Rangsit shopping centre. They moved to the apartment in Pathum Thani's Thanyaburi district two years ago.
She said Milsom was a friend of Louis and also an English teacher but she did not know where he taught. He often dropped by at their apartment, she added.
She said her husband suffered from chronic gout and had also been taking sleeping pills of late after complaining of stress.
On Friday night, she returned to the apartment from work and found the door was double-locked. She had the apartment security guards force open the door. She saw her husband and Milsom sitting in separate chairs and said they appeared to be dozing off.
At around 11pm, she called her husband to bed but he was not responding. But she did not suspect anything was amiss, thinking he was in a deep sleep after taking pills.
She woke up at about 5 am the next morning and found Louis and Milsom dead.
Police initially suspected that both men had medical conditions and that they might have taken too many sleeping pills.
The British and US embassies will be contacted and autopsies will be performed to determine the actual cause of death, police said.