A 19 year old Salisbury man has been sentenced to 20 years in prison for armed robbery and a firearms offense. A Wicomico County Circuit Court Judge has sentenced Courtlen Coston on Friday – Coston entered an Alford plea in March. Sentencing has been postponed to allow for a pre-sentence investigation. Coston and two others attempted a home invasion at a Salisbury home a year ago. Co-defendant Ryan Holden shot and killed the homeowner – Holden was convicted last month of 1st degree murder.