The Illinois Petition for Letters of Administration is a legal document that is used to request the appointment of an administrator for an estate when the deceased person did not make a will. This petition is typically filed with the probate court in the county where the deceased person resided. The petition typically includes the names of the deceased, the names of the beneficiaries, and a list of the estate's assets and liabilities. There are two types of Illinois Petitions for Letters of Administration: Independent Administration, where the administrator has full authority to manage the estate, and Supervised Administration, where the court oversees the administration of the estate. The petition must be signed by all beneficiaries and the administrator before it can be approved by the court.