Capturing the Unabomber

This episode takes viewers inside the FBI's investigation of one of America's most notorious terrorists, "Unabomber" Ted Kaczynski. The nation was on edge as a string of bombings killed and injured innocent Americans. How did the Unabomber choose his targets and elude capture for so long? Also featured is a new interview with his brother, the man who ultimately turned him in to authorities.

Airs: April 7, 2017 at 9p ET on HLN

Did a psychological test effect the "Unabomber?"

HLN's "How it Really Happened" recalls the psychological experiment that Ted Kaczynski, the "Unabomber," was subjected to while in college.

The Unabomber's manifesto

In this clip from "How it Really Happened," the "Unabomber" wrote a letter to the press claiming the bombings would stop only if they published his manifesto.

Season 1: Episodes