facility in north carolina used 0 to house inmates. i think it s important for transparency to fully understand the circumstances behind the death. i would caution speculation at this point. reporter: andrew about cable is a former fbi deputy director who was with the bureau as agents closed the unabomber case. it was in 1978 when kaczynski started his series of violence by leaving a mail bomb at a university. he would plant explosives on an airplane, university buildings and computer stores. he also mailed powerful bombs to university professors and business executives. by the time he was arrested in 1996, his 16 devices killed three people and injured 23 others. and it led investigators to his cabin in the woods tipped off by kaczynski s own brother. he pursued this as a way of striking back against