Compiled Laws, Chapter 168. Michigan Election Law § 168.56

Sec. 56.If a candidate of a political party for the office of governor, after having qualified as a candidate, dies after the time specified for filing in section 53,  1 leaving the political party without a candidate for that office, a candidate to fill the vacancy may be selected by the state central committee of that political party, and the name of the candidate selected shall be transmitted to the county officers required by law to print and distribute ballots. The name of the candidate shall be printed on the ballot, but if the primary ballots have been printed, the county officers shall have the ballots reprinted with the candidate's name on the ballots and the reprinted ballots shall be distributed to the various voting precincts in their respective counties.