The mother of the man accused of shooting Trooper Paul Butterfield will go to trail for her role in the case.
Tammi Spofford appeared in a Mason County courtroom Tuesday where she rejected a plea agreement.
Spofford is facing one count of accessory after the fact to murder and unlawful driving away of a vehicle.
She's facing up to 10 years behind bars for the two charges.
Spofford's son, Eric Knysz, and his wife, Sarah, were driving on Custer Road in Mason County on Sept. 9 when they were stopped by Trooper Butterfield.
During the traffic stop, Eric allegedly shot Trooper Butterfield, killing him, and left the scene.
After leaving the scene, court documents allege Tammi Spofford was involved in attempting to cover up the crime.
Her trial is scheduled to start on May 21.