To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. Read the history and status of medical aid in dying legislation in Maryland, through our organized timeline with all the details you might need.If there's no will, the bank may ask for evidence of your relationship to the deceased. Notify Bank of America. We'll ask you for the deceased customer's full legal name and Social Security number to identify their accounts. My mother passed away. What do I do to close out bank account. Prioritize Applications. • Process crisis and emergency applications first. Do not close your old bank account until electronic payments are received in your new account.