Shelby man pleads guilty to child porn possession. #OceanaCountyCrime By Allison Scarbrough, Editor. HART — A 52-year-old Shelby man faces serving a minimum prison term of nearly four years after pleading guilty in 27th Circuit Court Monday, April 8, to child sexually abusive material possession and fourth-offense habitual offender. Rodney Alvin Ramthun, of 4080 W. Baker Rd., is currently incarcerated…