nobody has 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. and the eyes obscured by aviator sunglasses. for more than 17 years, he operated without restraint. in all that time, no one knew who he was or how exactly he chose his targets. even his victims remained in the dark until he struck. >> i had never heard of the unabomber before i was injured. i had learned about the existence of the unabomber two days after i came home from the hospital. >> february 20th, 1987. an unseasonably warm and sunny day in salt lake city. police and emergency personnel respond to a report of an explosion outside cam's computer services. owner gary wright had arrived at his office at 10:25 a.m. >> when i had pulled into the parking lot, i noticed there was a piece of wood over to the right-hand side near my secretary's car. two two-by-fours that appeared to be nailed together. i thought well,