Shelby man pleads guilty to cutting off tether. #OceanaCountyCourts By Allison Scarbrough. Editor. HART — An 18-year-old Shelby man on probation for a conviction of receiving and concealing firearms pleaded guilty Monday, July 31, to a felony of a tampering with an electronic monitoring device in 27th Circuit Court. Logan Nathaniel Duvall, of 84 Ellis St., was arrested by the…