The sole suspect in the Tylenol poisoning murders that claimed seven lives and led to changes to how over-the-counter prescription drugs were manufactured and sold has died. James Lewis, 76, was found unresponsive at his home in Cambridge, Massachusetts, on Sunday, and pronounced dead soon after, authorities said. His death has frustrated law enforcement who had continued to pursue Lewis over the indiscriminate 1982 killing spree in the Chicago area that left six adults and a 12-year-old girl dead. Lewis was convicted of attempting to extort manufacturer Johnson & Johnson after sending a letter claiming responsibility for the deaths and demanding $1m to stop. He was questioned as recently as September over the poisonings, in which a suspect laced bottles of Tylenol with potassium cyanide. But no-one has ever been charged over the deaths, which led to widespread panic and sweeping changes to the way prescription drugs were bought and sold. Read More Utah mom accused of poisoning husband before writing grief book is sued for $13m by his family Thousands of unauthorized vapes are pouring into the US despite the FDA crackdown on fruity flavors Drugmaker lobbying group sues over plan to negotiate Medicare drug prices