The Unabomber 

How do you catch a twisted genius who aspires to be the perfect, anonymous killer—who builds untraceable bombs and delivers them to random targets, who leaves false clues to throw off authorities, who lives like a recluse in the mountains of Montana and tells no one of his secret crimes?

That was the challenge facing the FBI and its investigative partners, who spent nearly two decades hunting down this ultimate lone wolf bomber.

The man that the world would eventually know as Theodore Kaczynski came to our attention in 1978 with the explosion of his first, primitive homemade bomb at a Chicago university. Over the next 17 years, he mailed or hand delivered a series of increasingly sophisticated bombs that killed three Americans and injured nearly two dozen more. Along the way, he sowed fear and panic, even threatening to blow up airliners in flight.

In 1979, an FBI-led task force that included the ATF and U.S. Postal Inspection Service was formed to investigate the “UNABOM” case, code-named for the UNiversity and Airline BOMbing targets involved. The task force would grow to more than 150 full-time investigators, analysts, and others. In search of clues, the team made every possible forensic examination of recovered bomb components and studied the lives of victims in minute detail. These efforts proved of little use in identifying the bomber, who took pains to leave no forensic evidence, building his bombs essentially from “scrap” materials available almost anywhere. And the victims, investigators later learned, were chosen randomly from library research.

We felt confident that the Unabomber had been raised in Chicago and later lived in the Salt Lake City and San Francisco areas. This turned out to be true. His occupation proved more elusive, with theories ranging from aircraft mechanic to scientist. Even the gender was not certain: although investigators believed the bomber was most likely male, they also investigated several female suspects.

The big break in the case came in 1995. The Unabomber sent us a 35,000 word essay claiming to explain his motives and views of the ills of modern society. After much debate about the wisdom of “giving in to terrorists,” FBI Director Louis Freeh and Attorney General Janet Reno approved the task force’s recommendation to publish the essay in hopes that a reader could identify the author.

After the manifesto appeared in The Washington Post, thousands of people suggested possible suspects. One stood out: David Kaczynski described his troubled brother Ted, who had grown up in Chicago, taught at the University of California at Berkeley (where two of the bombs had been placed), then lived for a time in Salt Lake City before settling permanently into the primitive 10’ x 14’ cabin that the brothers had constructed near Lincoln, Montana.

Most importantly, David provided letters and documents written by his brother. Our linguistic analysis determined that the author of those papers and the manifesto were almost certainly the same. When combined with facts gleaned from the bombings and Kaczynski’s life, that analysis provided the basis for a search warrant. 

On April 3, 1996, investigators arrested Kaczynski and combed his cabin. There, they found a wealth of bomb components; 40,000 handwritten journal pages that included bomb-making experiments and descriptions of Unabomber crimes; and one live bomb, ready for mailing.

Kaczynski’s reign of terror was over. His new home, following his guilty plea in January 1998: an isolated cell in a “Supermax” prison in Colorado. 

Mugshot of Theodore Kaczynski, the Unabomber, following his arrest on April 3, 1996.

Theodore “Ted” Kaczynski—also known as the Unabomber


Cabin of Theodore Kaczynski, the Unabomber, in the woods of Montana, where he was arrested on April 3, 1996.

The cabin near Lincoln, Montana, where Kaczynski was arrested on April 3, 1996.


Watch a time-lapse video of Kaczynski’s cabin being reconstructed at FBI Headquarters in Washington, D.C.

Image of shrapnel from one of Ted Kaczynski’s (the Unabomber) bombs. These pieces stem from a February 1987 bombing in Salt Lake City, Utah.

Shrapnel from one of Kaczynski’s bombs. These pieces stem from a February 1987 bombing in Salt Lake City, Utah.

Timeline of Unabomber Devices 

  1. May 25, 1978: A passerby found a package, addressed and stamped, in a parking lot at the University of Illinois, Chicago Circle Campus. The package was returned to the person listed on the return address, Northwestern University Professor Buckley Crist, Jr. He did not recognize the package and called campus security. The package exploded upon opening and injured the security officer.

  2. May 9, 1979: A graduate student at Northwestern University is injured when he opened a box that looked like a present. It had been left in a room used by graduate students.

  3. November 15, 1979: American Airlines Flight 444 flying from Chicago to Washington, D.C., fills with smoke after a bomb detonates in the luggage compartment. The plane lands safely, since the bomb did not work as intended. Several passengers suffer from smoke inhalation.

  4. June 10, 1980: United Airlines President Percy Woods is injured when he opened a package holding a bomb encased in a book called Ice Brothers by Sloan Wilson.

  5. October 8, 1981: A bomb wrapped in brown paper and tied with string is discovered in the hallway of a building at the University of Utah in Salt Lake City. The bomb is safely detonated without causing injury.

  6. May 5, 1982: A bomb sent to the head of the computer science department at Vanderbilt University injures his secretary, after she opened it in his office.

  7. July 2, 1982: A package bomb left in the break room of Cory Hall at the University of California, Berkeley explodes and injures an engineering professor.

  8. May 15, 1985: Another bomb in Cory Hall at the University of California, Berkeley injures an engineering student.

  9. June 13, 1985: A suspicious package sent to Boeing Fabrication Division in Washington is safely detonated, but most of the forensic evidence was lost.

  10. November 15, 1985: A University of Michigan psychology professor and his assistant are injured when they opened a package containing a three-ring binder that had a bomb. The bomber included a letter asking the professor to review a student’s master thesis.

  11. December 11, 1985: A bomb left in the parking lot of a Sacramento computer store kills the store’s owner.

  12. February 20, 1987: Another bomb left in the parking lot of a Salt Lake City computer store severely injures the son of the store’s owner. A store employee sees the man leave the bomb, and that witness account helped a sketch artist create the composite sketch.

  13. June 22, 1993: A geneticist at the University of California is injured after opening a package that exploded in his kitchen.

  14. June 24, 1993: A prominent computer scientist from Yale University lost several fingers to a mailed bomb.

  15. December 19, 1994: An advertising executive is killed by a package bomb sent to his New Jersey home.

  16. April 24, 1995: A mailed bomb kills the president of the California Forestry Association in his Sacramento office.