By 2011, the FBI was ready to reexamine the evidence. A theory emerged: What if the Mad Poisoner was actually the Unabomber? Ted Kaczynski had proven he was a revenge-seeking terrorist, and he had connections to Chicago. Perhaps he traded homemade bombs for poisoned pills. Or maybe the deadly concoctions came straight from the Johnson & Johnson facility itself. In the absence of clear answers, only theories remain… and rumors that someone is still out there, replacing Halloween treats with fatal tricks. This is the finale of our crossover special from Serial Killers and Conspiracy Theories. Learn more about your ad choices. Visit podcastchoices.com/adchoices