own brother to his death. when ted was arrested, under the bed where he slept was another bomb wrapped in a package, apparently ready to be mailed to someone. reporter: ted kaczynski rejected his attorney s insanity defense and pleaded guilty to murder. he was sentenced to life in prison with no opportunity for parole. but to this day, david believes ted is insane and should be in a mental institution. my biggest regret is not to have clearer insight that he was ill. reporter: david continues to write to his brother twice a year in prison. he has never received a response. coming up it looks like a fireball. people let out a scream all around me. reporter: keira phillips on
that child kidnapper operated a torture chamber and private prison in the heart of our city. reporter: a daughter s sickening nightmare. if you would have asked me this last week, i would have you he s the best dad and best grandpa. he s dead to me. reporter: a brother s terrible discovery. my wife, linda, comes to me one day and says do you think there s any possibility that this unabomber might be your brother? there are 11 individuals or parts thereof that were recovered, and those would include 11 in tact skulls. reporter: a father s frustration. he was ordered by the court to undergo counseling. i visited the psychologist, but she did not indicate to me that she knew what was wrong. a single engine aircraft has crashed into a seven story building. reporter: a wife s horrible surprise. i can t imagine anybody doing anything like that. let alone my husband. reporter: a family s desperate attempt to prevent a massacre. his thought process was the w
a torture chamber and private prison in the heart of our city. reporter: a daughter s sickening nightmare. if you would have asked me this last week, i would have you he s the best dad and best grandpa. he s dead to me. reporter: a brother s terrible discovery. my wife, linda, comes to me one day and says do you think there s any possibility that this unabomber might be your brother? there are 11 individuals or parts thereof that were recovered, and those would include 11 in tact skulls. reporter: a father s frustration. he was ordered by the court to undergo counseling. i visited the psychologist, but she did not indicate to me that she knew what was wrong. a single engine aircraft has crashed into a seven story building. reporter: a wife s horrible surprise. i can t imagine anybody doing anything like that. let alone my husband. reporter: a family s desperate attempt to prevent a massacre. his thought process was the world was going to end on friday.
when ted was arrested, under the bed where he slept was another bomb wrapped in a package, apparently ready to be mailed to someone. reporter: ted kaczynski rejected his attorney s insanity defense and pleaded guilty to murder. he was sentenced to life in prison with no opportunity for parole. but to this day, david believes ted is insane and should be in a mental institution. my biggest regret is not to have clearer insight that he was ill. reporter: david continues to write to his brother twice a year in prison. he has never received a response. coming up it looks like a fireball. people let out a scream all around me. reporter: keira phillips on simmering anger. a deadly attack.
reporter: david continues to write to his brother twice a year in prison. he has never received a response. coming up it looks like a fireball. people let out a scream all around me. reporter: keira phillips on simmering anger. a deadly attack. i didn t know about the irs. i didn t know that he was violent. reporter: and a wife left searching for answers. how could i possibly know he would do anything like that?