responsible. tonight, a perspective of the most troubled and violent among those. we hear from wives, daughters, brothers and fathers of those who would commit unspeakable acts. >> 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 told you he's the best dead 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