§26-12-101.

§26-12-101.
   
   A. Except as otherwise provided in this section, whenever a vacancy
   shall occur in the office of a member of the United States Senate or
   United States House of Representatives from Oklahoma, such vacancy
   shall be filled at a Special Election to be called by the Governor
   within thirty (30) days after such vacancy occurs.
   
   B. No special election shall be called if the vacancy occurs after
   March 1 of any even-numbered year if the term of said office expires
   the following year. In such case, the candidate elected to said office
   at the regular General Election shall be appointed by the Governor to
   fill the unexpired term.
   
   C. If in an even-numbered year an incumbent United States Senator with
   two (2) or more years remaining in the term for which the incumbent
   was elected shall file with the Oklahoma Secretary of State before
   July 1 a resignation in writing which states that the resignation will
   not become effective immediately, but rather will become effective on
   some date certain which date is after the General Election, but before
   the convening of the next term of Congress, the vacancy shall be
   filled by a special election which shall be held in that even-numbered
   year on the same dates as the regular Primary Election, Runoff Primary
   Election and General Election. The filing period for the special
   election shall be the regular filing period prescribed in Section
   5-110 of this title. The person elected in the General Election of the
   special election shall take office on the date the resignation of the
   incumbent becomes effective and shall serve the remainder of the
   unexpired term.