Sources say Ted Kaczynski, popularly known as “The Unabomber,” died by suicide on Saturday.

Four sources familiar with the matter clearly To the Associated Press 81-year-old Kaczynski died after suffering from terminal cancer. his own hand Shortly after midnight on Saturday in a cell at the North Carolina Federal Penitentiary. Paramedics successfully resuscitated the notorious criminal after performing cardiopulmonary resuscitation, but Kaczynski died after being taken to a local hospital, officials said. (who was not authorized to speak publicly) told the Associated Press.

BREAKING: Ted Kaczynski, known as ‘The Unabomber’, died in prison by suicide after carrying out bombing campaigns that killed 3 and wounded 23 over 17 years, four people familiar with the matter say . @AP. https://t.co/7Ae1RbMyLt

— The Associated Press (@AP) June 11, 2023

A self-proclaimed environmental activist, Kaczynski has been serving a life sentence without parole since being arrested and convicted in 1996. Between 1978 and 1995, Kaczynski mailed or hand-delivered a series of bombs that ultimately killed three Americans and injured nearly two others. Dozens more. His terrorist activities have earned him the nickname “The Unabomber” as the authorities have been trying for almost two decades to bring him to justice. (Related article: Michigan professor: Unabomber Ted Kaczynski could be a savior of sorts)

A break came in 1995 when Kaczynski posed as an Unabomber and sent a 35,000-word essay explaining the motives behind the attacks. according to FBI. Then-FBI Director Louis Freeh and Attorney General Janet Reno decided to release the manifesto in the hope that someone could identify its author. Thousands of information were provided to authorities after the book was published, and multiple suspects were named, but one stood out above the rest – Ted Kaczynski, his brother He was presented as a suspect by David, the FBI said.

David provided authorities with letters and documents written by his brother that helped determine that the authors of the 35,000-word manifesto allegedly written by Ted Kaczynski and the Unabomber were the same person. When authorities finally approached Kaczynski, he found himself surrounded by dozens of bomb-making parts, handwritten diaries, detonation tests, and a single live bomb awaiting mailing in a humble cabin in Montana. found, the FBI said.

Kaczynski eventually pleaded guilty to the bombing and was sentenced to life in prison in Colorado. According to the Associated Press, Kaczynski was transferred to North Carolina in 2021 because the facility is equipped to treat patients with serious health problems.