Wis. Stat. § 59.37
Whenever there is a vacancy in the office of coroner, or when the coroner is absent from the county, sick or unable to perform the duties of that office, or for any reason, except the nonpayment of legal fees, refuses to serve and execute legal process against the sheriff in any action commenced in any court of record within the county for which the coroner was or should have been elected, any judge of a court of record or circuit court commissioner of the county may, on proof of the vacancy, sickness, absence or refusal to serve and execute such process, by an order to be endorsed on such process and addressed to him or her, empower any citizen of the county in which such process is to be served and executed to serve and execute the same; and that order shall be sufficient authority to the person therein named to serve and execute such process with like powers, liabilities and fees as the coroner.
Wis. Stat. § 59.37