Shocked neighbours reportedly found 29-year-old Kandra’s body under a blanket early on April 16, 2018.
Police claimed at the time Mr Smitham attacked her, covered her body and then went to bed.
He was arrested and held in custody, but was discovered with fatal injuries close to an outbuilding on the perimeter of the prison in August last year. He died later in hospital.
It is not yet known how he received the injuries.
An FCO spokesperson today told The Sun Online: “Our staff are providing support and advice to the family of a British man who died in Thailand in August 2018, and they remain in touch with the local authorities.”