10 ILCS 5/5-9.1
Upon establishment of an electronic reporting system for death registrations as provided in the Vital Records Act, the county clerk of the county where a decedent last resided, as indicated on the decedent's death certificate, may issue certifications of death records from that system and may use that system to cancel the registration of any person who has died during the preceding month and cause the name of each such deceased person to be erased from the register of the precinct in which the deceased person was registered. Regardless of whether or not such a system has been established, it is the duty of the county clerk to examine monthly the records deposited in his or her office pursuant to the Vital Records Act that relate to deaths in the county, to cancel the registration of any person who has died during the preceding month and cause the name of each such deceased person to be erased from the register of the precinct in which the deceased person was registered.
10 ILCS 5/5-9.1