How To Fill In an Affidavit of Death. To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account.The letter should include the deceased person's name, address, date of death, and mortgage or account number. Sample Letter – Asking for a debt write-off when someone is deceased. We're here to help when a loved one passes away. The death of someone close to you is difficult, and dealing with his or her finances can feel overwhelming. Please let me know if any other documents are required for claiming the amount of deceased. Request you to kindly process the request on priority. For example, if you inherit the deceased person's home or car – and there is still a loan out on it – you inherit that loan, too. The full legal name of the deceased person.