Theodore “Ted” Kaczynski, the Harvard-educated mathematician who retreated to a dingy shack in the Montana wilderness and ran a 17-year bombing campaign that killed three people and injured 23 others, died Saturday. He was 81. A spokesperson for a spokesperson for the federal Bureau of Prisons, tells The Associated Press that the man branded the “Unabomber” by the FBI died at the federal prison medical center in Butner, North Carolina. He was found unresponsive in his cell early Saturday morning and was pronounced dead around 8 a.m. A cause of death was not immediately known. He admitted committing 16 bombings from 1978 and 1995, permanently maiming several of his victims.