Maybe it's Almonds, Maybe it's Not by BJ Magnani
In 1982 seven people died in the greater Chicago area after cyanide was substituted in acetaminophen capsules sold in stores. Once the association was made between the product (Extra Strength Tylenol) and random deaths by potassium cyanide, panic ensued. Over 100,000 stories regarding the case ran in US newspapers. While the perpetrator was never found…
Source: mainecrimewriters.com