History's Greatest Mysteries Season 3 Episode 12
The Chicago Tylenol Murders
A series of unexplained deaths near Chicago in 1982 starts a nationwide panic; the victims are connected by one frightening detail: cyanide-tainted capsules of Extra-Strength Tylenol; 40 years later, it remains an active FBI investigation.
Guest Stars
Deborah Blum
Self - Professor of Journalism, MIT