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She had a bad headache just before her death
01:36 - Source: CNN

For more on this story, watch HLN’s “Something’s Killing Me” Sunday at 8 p.m. ET/PT.

Story highlights

A string of deaths in 1982, linked to cyanide-laced Tylenol, prompted drug makers to adopt some of the packaging we have today

No packaging is 100% tamper-proof

CNN  — 

It started with a series of mysterious deaths in the Chicago area on September 29, 1982: a 12-year-old in Elk Grove Village, a postal worker in Arlington Heights, a new mother of four in Winfield.

Inexplicably, they fell ill and were pronounced dead.

“We didn’t know what was happening, but everybody thought he died of heart attack,” said Joseph Janus, brother of postal worker Adam Janus.

But after relatives arrived to console their grieving family, another of Adam’s brothers, Stanley Janus, grabbed his chest and fell to the ground.