If a vacan­cy occurs in the office of a com­mis­sion­er, the Sher­iff, with the approval of a major­i­ty of the mem­bers of the Coun­ty Board, shall appoint a suit­able per­son to serve the unex­pired por­tion of that commissioner’s term.  If the Sher­iff fails to appoint a per­son to fill the vacan­cy with­in thir­ty (30) days, the Chair­man of the Coun­ty Board shall appoint a per­son to fill the unex­pired por­tion of the term, with the approval of a major­i­ty of the mem­bers of the Coun­ty Board.  (See 55 ILCS 5/3–8003).