Notify Bank of America. We'll ask you for the deceased customer's full legal name and Social Security number to identify their accounts."It only takes effect upon a person's passing. A letter of last instruction is an informal, non-legal document that provides guidance and critical information to your loved ones after your death. Creating a letter of instruction is an effective way to ensure your intentions are followed. Learn more about letters of instruction here. Provide a detailed list of all your assets, liabilities, and insurance policies, including account numbers, financial institutions, and contact information. Online: Use our online form to notify us about a customer's death. A letter of instruction is a document that guides a designated individual or entity on how to carry out specific actions or wishes after the author's demise. For assistance in completing this form, please contact the Northern Funds Center at 800-595-9111 weekdays from a.m.