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Mother of trooper's killer makes plea deal

MASON 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.