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. Download a free affidavit of death form. This sworn legal statement is signed to prove someone's death and settle estate distribution. To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. Enclose copy of his death certificate, copy of Pension Payment Order (PPO), your identity documents including Aadhar Card and PAN Card.