An American retiree with Alzheimer's disease vanished sparking a desperate search by his family in Thailand.

William Belle Hutton, 64, from Arizona, went missing from his home in Bangkok on the afternoon of January 11.

The 6ft expat, last seen in a blue shirt, orange shorts, and a crew cut, was last seen wandering near a fuel station at around 1:05 pm local time.

CCTV footage shows the husband ambling in front of the station with his walking stick. He then stopped, seemingly disoriented as he looked around at his surroundings, before walking back the way he came.

His Thai wife of 30 years, Wanna Chanthawong, 60, said he may have become lost due to his condition.

She said: 'We have been together for 30 years and have one son, who is 19. He has been living in Thailand since 1991. Previously, he worked as a golf instructor.

‘He has Alzheimer's. We didn't argue before he went missing, and he had never gone missing before. His Alzheimer's symptoms likely started around 2020 and became more noticeable toward the end of that year.

'He became ill and went into a coma. After nearly a year, when he regained consciousness, he could not remember anything.

‘Doctors scanned his brain and found that it had shrunk. The treatment was very expensive, so I decided to care for him at home.'

Despite his memory loss, William was still able to walk and live a mostly normal life, often going out for short daily walks near their home.

His wife added: 'He walked every day, but only to the Hua Hin intersection and then back home. This time, he walked much farther, almost reaching Phahonyothin Road.'

The family said they have filed a report with the Chok Chai Police Station, and a search has been launched for the missing pensioner.

Authorities urged those who may have seen him to immediately notify the police.