This is to notify the bank that my. (Relationship with deceased).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. Online: Use our online form to notify us about a customer's death. Enter the 6 letters or numbers shown within the image above. Letters are not case-sensitive. The bank will not allow you to close it unless you have a letter of authorization from the probate court. Government agencies and programs to notify of a death.