>> for almost two decades, he skillfully evaded identification and capture. >> we had literally hundreds and hundreds of suspects. >> he dropped out of sight for six years. >> people thought he was dead. >> he was obsessed about leaving fingerprint evidence. >> nobody has ever seen anybody like theodore kaczynski. >> "the hunt for the unabomber." next. ♪ a simple sketch was almost all investigators had to go on. the facial features were distinct, but the head was cloaked by a hood.