40 ILCS 5/8-152.1
Notwithstanding Section 8-152 or any other provision of this Code to the contrary, if (1) a member has a spouse who would have qualified for a minimum annuity for widows under Section 8-150.1 at the time of the member's retirement, (2) the qualifying spouse dies, (3) the member subsequently remarries, and (4) the member does not receive a refund under Section 8-169, then the member's widow shall be entitled to a widow's annuity if (i) the member dies after May 1, 2004 and before November 1, 2004 and (ii) the widow was married to the member for at least the last 10 years prior to the member's death. A widow who elects to receive a widow's annuity under this Section is thereafter ineligible to receive any other survivor's benefit under this Article. A widow who is receiving any survivor's benefit under this Article is thereafter ineligible to receive a widow's annuity under this Section. If a widow who is receiving a widow's annuity under this Section remarries, then the benefits paid to that widow shall be terminated effective on the last day of the month in which the widow remarries. To establish credit under this Section, the widow must apply to the Fund on or before July 1, 2006.
40 ILCS 5/8-152.1