A 20-year-old man convicted of first-degree murder for fatally shooting a Michigan state trooper during a traffic stop faces life in prison without the possibility of parole.
Eric Knysz is scheduled to be sentenced Tuesday in Mason County after being found guilty in the September slaying of 43-year-old Trooper Paul Butterfield II.

The charge carries a mandatory penalty of life in prison.
Prosecutors said Knysz had stolen guns with him when Butterfield pulled over his pickup truck in the west-central Michigan county.

Defense attorney David Glancy argued during trial that the only witness who could place Knysz in the pickup that day was his wife, Sarah, who testified against him.

She received a sentence of two to five years in prison as an accessory after the fact.