unabomber had evaded capture, outwitting law enforcement by using low tech methods and staying off the grid. but after he was spotted in a parking lot in 1987, he seemed to vanish. >> it has been a year since the unabomber left his angry mark of death. >> after he committed that bombing and that composite was circulated in 1987, he dropped out of sight for six years. 6. >> he could have been incarcerated. he could have had health issues but you know you also have to realize it was the first time ever since 1978 that he had ever been seen placing a device. so, it could have been because he was fearful that he would be caught. >> the unabomber from 1987 to 1993 did nothing. people thought he was dead but what he was doing, he was really learning how to build better bombs. >> wasn't until june of 1993 that the unabomber surfaced