His brother David turned him in after reading the terrorist's manifesto. The tip that ultimately helped the FBI find and arrest Kaczynski came from his very own brother, David. "I felt a kind of chill," David recalled at the 2007 lecture. Following the arrest, authorities found a number bombs being built in Ted's cabin, one of which was addressed, intended to be sent to his next victim." After turning his brother in, David Kaczynski became an anti-death penalty activist and was the executive director of New Yorkers Against the Death Penalty from 2001 to 2012.

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Persons: Ted Kaczynski, David, —, Kaczynski, David Kaczynki, Ted, David Kaczynski Organizations: Service, FBI, Cornell University, Washington Post, Cornell Daily Sun Locations: Montana, Harvard, Woodstock , New York