Eric Knysz is guilty in the murder of Michigan State Trooper Paul Butterfield. A jury found 20-year-old Knysz guilty of first-degree murder of a peace officer, felony firearms, carrying a concealed weapon and unlawfully driving away a motor vehicle. Witness testimonies concluded yesterday and Knysz chose not to take the stand. The jury deliberated for about two hours before reaching a verdict. Knysz will be sentenced April 8th. He faces life in prison.