Another mystery death in Chiang Mai

American Mariam Soraya Vorster, a 33-year-old from Seattle working as a guide in Chiang Mai, died on January 11 - just over three weeks before 23-year-old Sarah died.

Ms Vorster's husband Tony Pandolo told the Herald his wife was perfectly fit and healthy and became sick with symptoms of food poisoning before she died.

"I kept asking about the health department, or what the next steps would be with the restaurant," Mr Pandolo said. "No one really seemed to know, and it turns out no one really did anything.

"Soraya had an autopsy at University Hospital in Chiang Mai on January 12 or 13 and we still have no results."

Ms Vorster's death is one of five in a six-week spell in Chiang Mai.

Local woman Waraporn Pungmahisiranon died two days before Sarah and British pensioners George and Eileen Everitt died less than two weeks later.

Those deaths were all in the same hotel - the Downtown Inn.

Mr Pandolo said his wife was staying in a different hotel, but the symptoms were the same.