The Zodiac killer was our modern day Jack the Ripper. Both maintained a small circle in which they chose to kill, and both only have a very small agreed upon number of victims (JTR has 5 Zodiac has 5 fatalities and 2 seriously injured). The Zodiac himself claimed 37 plus victims; and how he communicated with the investigators and the newspapers of the late 1960s/early 70s was what really set the Zodiac apart from all of the other usual slice and dice killers of his day; the cryptograms; the harassing phone calls and letters. 
And worst of all, the Zodiac killer was never caught.
Join Debbie Q and the right shoe on this rabbit hole journey in and around the victims, the ways, and the ultimate person who I think the Zodiac Killer to be, this case is as complex as it is bemusing, it is truly an odd tale of a killer who whisked through the San Francisco area, was getting bolder with each subsequent killing, and then suddenly stopped. 
What happened to him? And who was he?