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). You'll need the person's Social Security number and certified copies of their death certificate for most agencies and programs. Social Security and Medicare. Start the letter with your introduction and the reason for writing the letter. Closing a bank account when someone passes away isn't difficult, as long as you have the right paperwork for the the teller or banker. Synchrony offers an online option to provide the Bank with the notification of the passing of the cardholder. Name of Deceased had permanent legal residence at.