Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. Coping with the loss of a loved one is difficult. To make important decisions during this time easier, consider following the task list provided below. Government agencies and programs to notify of a death. A copy of the death certificate is attached. Signature. Name (type or print). Address. After the affidavit is notarized, you could take it with a copy of the death certificate to your father's bank. This could just be a death certificate and your driver's license.