Uncover the true and horrific stories of 11 of the deadliest serial killers of all time, in this episode of History Countdown.
On April 3, 1996, a CBS news report announces the arrest of Theodore Kaczynski, the Harvard graduate who was suspected and later proven to be the Unabomber. Kaczynski terrorized the country for nearly two decades with a series of mail bombings that killed three people and wounded 23.