Former FBI agent Candice DeLong revisits one of the biggest cases she worked during her years as a rookie agent in Chicago: the death of seven innocent people who ingested poisoned Tylenol in 1982. She reveals the devastating false lead that she and her partner pursued for two weeks, as well as the mind games played by the prime suspect in the murders. Candice also discusses how the killer’s ability to elude capture nearly 40 years later weighs on her to this day.

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