Miss. Code § 23-15-843
In case of death, resignation or vacancy from any cause in the office of district attorney, the unexpired term of which shall exceed six (6) months, the Governor shall within ten (10) days after the vacancy occurs issue a proclamation calling an election to fill a vacancy in the office of district attorney to be held on the next regular special election day in the district where the vacancy occurred unless the vacancy occurs in a year in which a general election would normally be held for that office as provided by law, in which case the appointed person shall serve the unexpired portion of the term. Candidates in such a special election shall qualify in the same manner and be subject to the same time limitations as set forth in Section 23-15-839. Pending the holding of a special election, the Governor shall make an emergency appointment to fill the vacancy until the same shall be filled by election.
Miss. Code § 23-15-843