In the fall of 1982, seven people in the Chicago area died after taking Tylenol capsules that had been laced with cyanide. The victims ranged from a 12-year-old girl to a young mother who had just given birth. None of them knew each other, and none of them had any idea what was in the bottles sitting in their medicine cabinets. The killings triggered a nationwide panic, transformed how every over-the-counter medication is packaged, and gave rise to the term "product tampering" as a federal crime. But more than four decades later, no one has ever been charged with the murders. In this episode of Murder: True Crime Stories, host Carter Roy revisits one of the most chilling unsolved cases in American history, the suspects who came and went over the years, and the question that still haunts investigators: who walked into those stores, and why did they choose Tylenol?

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