Ted Kaczynski, who was branded the Unabomber, has been found dead in his US prison cell at the age of 81.
Kaczynski, who was serving life without the possibility of parole following his 1996 arrest at the primitive cabin where he was living in western Montana, was found dead around 8am (local time) at a federal prison in North Carolina.
The cause of death was not immediately known.
