WWMT - wwmt.com - Search Results The following is an archived video story. The text content of that video story is available below for reference. The original video has been deleted and is no longer available. Mother of trooper's killer makes plea dealMASON COUNTY, Mich. (NEWSCHANNEL 3) - The mother of the man who murdered Michigan State Police Trooper Paul Butterfield has pleaded no contest to accessory after the fact to a felony.Tammi Spofford made the plea Tuesday. In return, the prosecutor's office dropped a charge of unlawfully driving away a motor vehicle.Spofford will be sentenced June 17th.Eric Knysz shot and killed Trooper Butterfield during a traffic stop in September of 2013.He was sentenced to life in prison on April 8th.He tried to kill himself less than a week later by hanging himself with a bed sheet in his jail cell.He died April 17th.