Learn how to execute a living trust after death in California with our stepbystep guide, covering essential documents, tax filing, and asset distribution. Notify Bank of America.We'll ask you for the deceased customer's full legal name and Social Security number to identify their accounts. A letter of last instruction is a document that outlines funeral planning processes and arrangements. Writing a letter of instruction can help expedite the estate planning process. To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. A letter of instruction is a nonbinding document that explains your personal preferences and last wishes in plain language. How do I open an estate account? Just make an appointment at your local financial center and an associate will be happy to assist you. The bank will also need to see a copy of the Certificate of Trust naming the successor trustee, and the bank will have some forms that need to be filled out.