 A state prison inmate who didn't return to the Rapid City Minimum Center after a work assignment back in February is back in custody. The South Dakota Department of Corrections says 31-year-old Curtis Milk was arrested Monday in Santa Cruz, California. The DOC says Milk did not return to the Rapid City Center on February 2nd. At the time, Milk was serving sentences for third offense DUI and possession of a controlled substance out of Pennington County. Second-degree escape carries an additional sentence of up to five years in prison.