Ill. Admin. Code tit. 80 § 1540.70
Any person claiming a death benefit or survivor's annuity shall file at the Springfield Office of the System a written application for such benefit on a form prescribed by the Board.
An application for a death benefit or survivor's annuity shall be accompanied by a certified copy of the Certificate of Death for the deceased member or annuitant.
Any person or persons applying for a survivor's annuity or death benefits of any kind shall, when requested by the Board, file at the Springfield Office of the System an affidavit alleging at least the name of the claimant and his or her relationship to the deceased member.
The occupational death benefits and survivors' annuities payable to the unmarried adult disabled children of deceased members and annuitants under Article 14 of the Illinois Pension Code are subject to suspension and termination for gainful activity in accordance with Section 1540.85.
Ill. Admin. Code tit. 80, § 1540.70