Mich. Comp. Laws § 168.146: Representative in congress; vacancy, creation.

Sec. 146.

The office of representative in congress shall become vacant on the happening of any of the following events before the expiration of the term of such office: The death of the incumbent; his resignation; his removal from office; the decision of a competent tribunal declaring void his election; or his refusal or neglect to take his oath of office.