Sarah Knysz pleads guilty to charges in trooper death

<p>Sarah Knysz, left, pleaded guilty to charges related to the shooting death of Michigan State Trooper Paul Butterfield. Her husband, Eric Knysz, is charged with Butterfield's murder.</p>

The woman accused along with her husband in the shooting death of a Michigan state trooper pleaded guilty to charges Tuesday.

WOOD-TV reports Sarah Knysz sat in court Tuesday afternoon in Mason County alongside her attorney. Knysz was charged with being an accessory after the fact and driving a vehicle away from the scene of a crime.

Trooper Paul Butterfield was shot to death in September during a routine traffic stop allegedly by Knysz' husband, Eric Knysz.

Knysz told a judge that her husband was trying to sell guns the day Trooper Butterfield was killed.

"I witnessed my husband shoot the state trooper," Knysz told the judge.

Eric Knysz remains jailed in the death of Trooper Butterfield. His next court appearance is not expected until early next year.