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). Start the letter with your introduction and the reason for writing the letter. Give application to the bank or treasury as the case may be informing passing away of the Pensioner. Sample Letter – Asking for a debt write-off when someone is deceased. To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. Also, if your name is written on a power of attorney document besides being named in the bank account as the next to kin. You can complete the application at your local CSS office or apply online.