Mich. Comp. Laws § 168.165
If a candidate of a political party for the office of state senator or state representative, as applicable, after having qualified as a candidate, dies after the last day for qualifying as a candidate, leaving the political party without a candidate for the office of state senator or state representative, a candidate to fill the vacancy caused by the death may be selected by 3 delegates elected by a majority of the precinct delegates and nominees for state representative and state senator of the candidate's political party from within the senatorial or representative district. However, if the senatorial or representative district comprises more than 1 county, the meeting shall be called and conducted by the chairperson of the state central committee or his or her authorized representative. The name of the candidate selected under this subsection shall be transmitted to the county officials required by law to print and distribute ballots. The county officials shall print the name of the candidate selected under this section on the ballot in place of the deceased candidate, or if the ballots are already printed, have the ballots reprinted with the candidate's name on the ballots and the reprinted ballots shall be distributed to the various voting precincts within their respective county.
MCL 168.165