hideously lethal. >> matches, pieces of wood, nails. >> that's an anti personal device. that's used to kill. >> for almost two decades, he 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 seen anybody like him. >> the hunt for the unabomberer 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. and the eyes obscured by aviator sunglasses.