The Unabomber Ted Kaczynski was discovered dead in his cell early on Saturday, according to a Federal Bureau of Prisons official. He was 81.

Theodore “Ted” Kaczynski, the Harvard-educated mathematician, retreated to a dingy shack in the Montana wilderness and ran a 17-year bombing campaign that killed three people and injured 23 others.

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He was discovered unconscious in his cell early on Saturday and was pronounced dead at 8 a.m. The cause of death wasn’t known right away.

He had been detained at the federal Supermax prison in Florence, Colorado since May 1998, when he was given four life sentences plus 30 years for a terror campaign that caused universities all over the country to be on edge, before being transferred to the prison medical center. He admitted carrying out 16 explosions between 1978 and 1995, leaving several of his victims permanently disabled.

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The deadly homemade explosives created by the Unabomber altered how Americans boarded airplanes and sent parcels years before the Sept. 11 attacks and the anthrax mailing. In fact, in July 1995, aviation traffic on the West Coast was all but shut down.

He compelled The Washington Post and The New York Times to make the difficult choice to publish his 35,000-word manifesto, “Industrial Society and Its Future,” in September 1995. In it, he stated that contemporary culture and technology were causing people to feel helpless and alienated.

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But it led to his undoing. Kaczynski’s brother David and David’s wife, Linda Patrik, recognized the treatise’s tone and tipped off the FBI, which had been searching for the Unabomber for years in nation’s longest, costliest manhunt.

In April 1996, authorities discovered him in a cabin made of plywood and tarpaper that measured 10 by 14 feet (3 by 4 meters) west of Lincoln, Montana. The cabin was stocked with notebooks, a coded diary, explosive materials, and two finished bombs.

The Unabomber attracted a fair number of admirers and similarities to Henry David Thoreau, Edward Abbey, and Daniel Boone as a shady criminal mastermind.