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. The letter is hand dated December 18, 2012. Ted has hand signed at the top, Ted Kaczynski, and hand signed again at the close, Ted Kaczynski.

Includes the original prison mailed envelope postmarked December 21, 2012 completely written by The Unabomber and  hand signed, Theodore John Kaczynski.