A 20-year-old Irons man was sentenced this afternoon to life in prison for killing Michigan State Trooper Paul Butterfield during a September 2013 traffic stop.

Eric Knysz received a life term from Mason Circuit Court Judge Richard Cooper, The Ludington Daily News reported.

Eric Knysz (Photo: Mason County Sheriff's Office)
Eric Knysz (Photo: Mason County Sheriff's Office)
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In February, a Mason County Circuit Court jury of nine women and three men found Knysz guilty of murdering Butterfield in a shootout at a gas station.

Knysz was found guilty of the murder of a peace officer, stealing a car and two weapons charges.

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