What happens to a marriage extension visa in Thailand if my spouse passes away?

Hypothetical question which I am sure affects many here.

I understand that if on a marriage extention, it is cancelled immediately when divorced.

But what happens if your spouse passes away?

Does immigration expect you to put your grief aside and go to immigration the next day and get a seven day refusal.

Seems unreasonable in the circumstances.

Or can you immediatly apply forcretirement visa if you have sufficient seasoned money in bank ?

Thanks.