My husband and I are Americans who have been living on retirement visas in Chiang Mai, Thailand for nearly nine years. When we first came, I was carried as a dependent on my husband's retirement visa since he has pension income and I was too young to start my pension. However, Thailand permits someone to financially justify their retirement visa either with income or a deposit in a Thai bank and we decided to bring funds into Thailand for a "retirement visa bank account" in my name so I could obtain my own, independent retirement visa.
The funds needed are about RM 100,000 (800,000 baht) and earn interest similar to what you earn on your Malaysian visa bank deposits.
We decided to make the move after learning of horror stories of expat women who lost their ability to stay in Thailand when their husbands died. Their visa status ended when the marriage ended. Even with a Final Will in place, in usually takes 30 - 45 days to claim bank accounts and life insurance so that a widow will have sufficient funds in her name to justify her own retirement visa. Thai Immigration gives just 7 days after the end of a marriage to leave the country and make other visa arrangements, like getting a tourist visa from a consulate/embassy in a neighboring country.
What happens in Malaysia if a husband, the holder of a MM2H visa dies? Does the wife have to clear out right away? At least in Malaysia, U.S. citizens get 90 day visa-exempt entry (unlike 30 days in Thailand), so a border run could gain enough time to sort out the finances. But still, a quick trip out of the country isn't something most new widows would want to do.