I found it odd that Unsolved mysteries never covered the East coast Zodiac to the best of my knowledge? He shot 9 people and also sent letters to the newspapers. He was a copycat. It happened in the early 1990's during the NBC glory days. Jack the Ripper was also something never done by unsolved to the best of my memory. It's unusual since John Cosgrove either produced or directed a film about Jack in 1986 or 1987. Here is a link to the other zodiac.

http://www.karisable.com/skazzodiac.htm

That would've been cool if UM did a segment on the Zodiac just by itself.....like Son of Sam in the NBC 'glory days' of the show.