Theodore John Kaczynski aka the "Unabomber" is a former mathematics professor, a domestic terrorist, and serial killer who between 1978 and 1995 killed 3 and wounded 23 others by attempting to start a nationwide combing campaign targeting people involved with modern technology.  Kaczynski was found dead in his cell on June 10, 2023. One page handwritten letter hand signed twice, hand dated June 8, 2003. Hand signed at the top, Ted Kaczynski, hand signed again at the close, Ted. Includes the original prison mailed envelope completely written by The Unabomber, hand signed, Theodore John Kaczynski.