WINONA, Minn. — A Rushford school bus driver engaged in illicit sexual conduct in 2016 on a school bus, according to Winona County authorities. A criminal complaint alleging third-degree sexual assault against Timothy Thomas Wilkemeyer, age 53, is in process, said sheriff’s investigator Mark Dungy. The third-degree Minnesota statute covers sex with minors. Although Rushford is in Fillmore County, the school district has student pick-ups north into Winona County almost to Interstate 90. Wilkemeyer lives in Rushford.