70 ILCS 3305/4
Whenever a vacancy in the board of trustees shall occur, either by death, resignation, refusal to qualify or for any other reason, the circuit court, as that term is defined in Section 3 of this Act, shall fill such vacancy by appointment for the unexpired term; and such person so appointed shall fill the vacancy until the next regular election for that office.
(from Ch. 121, par. 358)
(Source: P.A. 81-1489.)