What should someone do if their spouse dies while on a marriage-based extension of stay in Thailand?

When a foreigner on a marriage-based extension of stay in Thailand experiences the death of their Thai spouse, they should follow specific procedures regarding their visa status. Initially, although the reason for holding the visa has changed, the current extension remains valid until its expiration. The individual must notify immigration of the spouse's death, ideally within a reasonable time frame (1-2 weeks), bringing necessary documents such as the passport and the death certificate. If they wish to transition to a retirement visa, they may need to provide evidence of sufficient funds, generally needing an 800,000 baht balance, which should be maintained for 2 months before applying. Lastly, if currently on a multi-entry Non-O visa based on marriage, they can continue to use the visa until it expires, regardless of the spouse's passing.