Compiled Laws, Chapter 168. Michigan Election Law § 168.135

Sec. 135.  If a candidate of a political party for the office of representative in congress, after having qualified as a candidate, dies after the last day for qualifying, leaving the political party without a candidate for the office of representative in congress, a candidate to fill the vacancy may be selected by 3 delegates elected by a majority of the precinct delegates and nominees for state representative and state senator in a state representative or state senatorial district of the candidate's political party from within the boundaries of the congressional district.  If the 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 shall be transmitted to the county officials required by law to print and distribute ballots.  The name of the candidate shall be printed on the ballots, but if the ballots have been printed, the county officials shall have the ballots reprinted with the candidate's name on the ballots and the reprinted ballots shall be distributed to the various 7 voting precincts within their respective counties.