UPDATE: One Suspect Charged, Second To Be Officially Charged Fri - Northern Michigan's News Leader

UPDATE: One Suspect Charged, Second To Be Officially Charged Friday

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UPDATE: September 13

The man accused of killing Trooper Butterfield will be officially charged Friday, September 13 at 4:30 in Mason County.

Eric Knysz underwent more surgery Thursday, he was hit in a shootout with police just before being arrested.

According to the Magistrate, Eric could be formally charged Friday afternoon if he is released from the hospital. 

He is charged with homicide murder of a police officer, felony firearm, carrying a concealed weapon, unlawful driving away of a car and habitual offender. 

He faces up to life in prison for the murder of Trooper Paul Butterfield. 

His wife Sarah was arraigned on Wednesday on charges of accessory after the fact and unlawful driving away of a car. 

Stay with 9&10 News for the latest developments. 

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September 11

The woman police say was involved in the shooting of Trooper Paul Butterfield has been officially charged. 

Sarah Knysz was charged Wednesday with accessory after the fact, and unlawful driving away of an automobile. The prosecutor says Sarah could face more charges as the investigation unfolds.

Her husband, Eric, was still in the hospital as of Thursday morning. The judge currently overseeing the case in Mason County tells 9&10 News that Eric remains hospitalized, and will not be formally charged today.

Trooper Butterfield pulled the married couple over near the intersection of Townline and Custer roads in Mason County Monday evening. It's unclear right now why he pulled them over, but the prosecutor said nothing seemed out of the ordinary.

It was during that quick stop police say Eric shot the trooper in the head, and took off.

From there the couple headed to Dublin in Manistee County where they were arrested after a brief shootout with police. Eric was shot in the confrontation, but his injuries weren't life-threatening.

Investigators believe the couple also stole a car in Mason County, and were in that vehicle when police caught up to them in Manistee County.

9&10's Breelynn Martin continues to follow developments in the case.