Upon the death of an annuitant receiving a retirement annuity or disability retirement annuity, the annuitant's beneficiary shall, if a survivor's insurance benefit is not payable under Section 15-145 and an annuity is not payable under Section 15-136.4, be entitled to a death benefit equal to the greater of the following: (1) the excess, if any, of the sum of the accumulated normal, survivors insurance, and additional contributions as of the date of retirement or the date the disability retirement annuity began, whichever is earlier, over the sum of all annuity payments made prior to the date of death, or (2) $1,000.
40 ILCS 5/15-142