To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. Enclosed with this letter are the death certificate and my legal authorization as the executor.Give application to the bank or treasury as the case may be informing passing away of the Pensioner. The letter shall start with the sender's address, date, bank's address, and with a salutation. A bank closure letter may be needed if you want to close a bank account without having to go to your bank's physical location. To close a bank account after death, you must completely liquidate its funds. Once you submit a bank closure letter to the bank, they're supposed to close the account or accounts listed in the letter. For many of the proceedings, a "checklist" is available on the related forms page. Aadhar card; Mother's death certificate; Bank passbook. Sample Letter to Bank about the Death of Joint Account Holder.