Ted Kaczynski, known as the "Unabomber,'' was found unresponsive in his cell at the Federal Medical Center in Butner, North Carolina and pronounced dead later Saturday morning.

Theodore "Ted'' Kaczynski, the Harvard-educated mathematician who retreated to a dingy shack in the Montana wilderness and ran a 17-year bombing campaign, died Saturday.

Ted Kaczynski reportedly sent a letter to a journalist stating “some creep in Santa Barbara, California,” has been sending letters to the media claiming to be correspondence from him.