Sample Letter – Asking for a debt write-off when someone is deceased. Sample Letter to Bank Informing the Death of the Account Holder.The death claim letter should be written in the formal letter format. 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. Use our Affidavit of Death form to verify the death of a family member and help with the inheritance process. 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. Download a free affidavit of death form. This sworn legal statement is signed to prove someone's death and settle estate distribution.