INSTRUCTIONS: Fill out this Declaration completely and provide accurate information. Make at least one copy.A letter of last instruction is a document that allows you to organize and give your family instructions pertaining to your final wishes. (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. You will need to discuss with your mother's banks the disposition of her accounts now. To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. This might include a court order, a letter from the executor of the estate, or other legal documents. Information and resources on how to get a certified death certificate in Arizona from the Arizona Department of Health Services. Defense lawyers may seek to challenge it all the way up to the Supreme Court. Trump Special Counsel.