BILLINGS – Roger Frandsen, 37, walked away from the Alpha House Men’s Prerelease Center late Saturday night.
Frandsen was sentenced for assault on an officer in Cascade County in August of 2014.
He is a 5 foot, 7 inch, 205 pound Native American man with brown hair and eyes.
Authorities advised anyone who sees Frandsen not to approach him, but to contact law enforcement immediately.
A warrant has been issued for his arrest.