The affidavit is often coupled with a copy of the death certificate. The affidavit can then be used to complete the distribution of property.For additional information, including links to important forms and how to connect with the Decedent Estate courtrooms, click on the tabs below. The Petition for Letters of Administration is the document that is used when the decedent died without a will. If the decedent dies without a Will, a Petition for Letters of Administration is filed. If one dies without a Will, he or she dies "Intestate. " Since, there is no Will to file, there is no individual specifically identified as an executor. "Letters of Office" is not really a letter. This comprehensive guide aims to shed light on the complexities of dying without a will, also known as dying intestate, in the state of Illinois. Court Forms for the Probate Division.