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. 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. Enter the 6 letters or numbers shown within the image above. Letters are not case-sensitive. In this video, we discuss an important aspect of estate planning: how to prevent your bank accounts from being frozen at the time of your death. Proof of Death of the Account Owner or all Account Owners in the case of a joint account. b. An Affidavit and Action Request executed under oath in such form.