Parole Is Being Sought By A Sullivan County Man Who Killed His Mother And Sister 25 Years Ago. Nathan Callahan Was Just 15 Years Old At The Time Of The Killings In 1994 And Is Currently Serving A Life Sentence. The Chairman Of The Tennessee Parole Board Denied His Request. The Remaining Members Of The Board Will Have To Vote In Order To Finalize The Chairman’S Decision. Results Are Expected Within The Next 10 Days.