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 prison cell on June 10, 2023.

8 1/2" x 11" left hand tracing hand dated and hand signed, Ted Kaczynski 7/21/03.