Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.This is to notify the bank that my. (Relationship with deceased). This letter is from an executor notifying a bank about an account holder's death. After you've finished the outline, you can begin writing your letter of instruction and filling in the details. A letter is sometimes the most effective way to send a particular message. Start the letter with your introduction and the reason for writing the letter. Q: What information should be included in the letter? San Diego Blood Bank.