Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.A letter of last instruction is an organized way for you to give your family all the facts about your finances—and have a basic tool for your own. I am writing to request that a formal death notice be placed on the credit file of: Deceased's full name (with middle initial if used):. Most recent address:. What do you write in a death notice? Discover the precise steps to secure Letters of Testamentary in California. Our comprehensive guide makes the process straightforward and hassle-free.