Thai police are investigating the deaths of a retired British couple who were on holiday in the northern Thai city of Chiang Mai.
George and Eileen Everitt, from Boston, Lincolnshire, died on 19 February, the Foreign and Commonwealth Office said.
It is not known how they died; police said there was no sign of violence.
A spokesperson from the Foreign and Commonwealth Office said: "We are in touch with the family and are helping them through this very difficult time".
Thai police told the BBC that the couple were found dead in their room at the DownTown Inn, where they had checked in on 9 February.
Mrs Everitt, 74, was found lying on the bed, while Mr Everitt, 78, was in a sitting position on the floor, with his face falling forward on to the bed.
Police said no drugs, medicine or poison were found in the room.
Nor was there any evidence of violence or fighting in the room or any wound on their bodies.
The bodies are being kept at Maharaj Nakorn Chiang Mai Hospital for post-mortem examination.
The police have reached no conclusion yet on why or how the couple died.