Trooper Butterfield memorial service Thursday. FREE SOIL TOWNSHIP — On Sept. 9, 2013, Michigan State Police Trooper Paul Butterfield was murdered on Custer Road north of Townline Road by a 19-year-old Irons male during a routine traffic stop. Butterfield, 42, lived in Grant Township and was assigned to the MSP Hart post. The annual memorial service honoring Butterfield will be…