A Kingsport Man Who Plead Guilty To Two Rapes In Johnson City Is Being Cast By Prosecutors As A Serial Rapist. 47 Year Old Thomas Richard Coburn Will Have To Serve 12 Years In Prison With No Possibility Of Release. He Was Also Sentenced To An Additional Six Years On Two Counts Of Criminal Exposure Of Another To HIV. He Will Serve 35 Percent Of That Part Of The Sentence Before Being Eligible For Parole. He Will Be Placed On Community Supervision For Life.