A New Hampshire prison inmate who walked away from a transitional housing unit in Manchester Friday is heading back to prison. Police said an officer spotted 53-year-old Antonio Dustin walking in Manchester Monday morning and arrested him without incident. Dustin was convicted of failing to register as a sex offender. After spending a year and a half in prison, he was moved to the transitional housing unit and was allowed to leave the facility for work. He was placed on walkaway status Friday evening after failing to return on time.