To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. (Arizona Revised Statutes, Section 14-3971)You would simply get the form and instructions from the court's website, fill out the form and have it notarized.When listing a bank account, brokerage account or annuity, you will want to list the value as of the date of death. To close a bank account after death, you must completely liquidate its funds. This Agreement covers your rights and responsibilities concerning your accounts and the rights and responsibilities of the Credit Union providing this. Question: My mother passed away. She does have a will and I was nominated as the executer and trustee.