The Chicago Tylenol murders took place in Chicago in 1982. Seven people were killed after multiple pills containing cyanide were placed in extra strength Tylenol bottles and sold to an unsuspecting public. The Tylenol murders were never solved, but thanks to a speedy response from manufacturers, the public was able to return to taking over-the-counter medications once again. However, in 1986, 52 year old Bruce Nickell came home from work with a headache. According to his wife, 42 year old Stella Nickell, Bruce took four extra strength Excedrin capsules and, minutes later, collapsed. Though it was years later, someone was once again tampering with over-the-counter pain medication. Only this time, the case of the Excedrin murders would not go cold, and the mystery of who was placing poison on store shelves would be solved.

Sources:

The Tylenol Murders

https://en.wikipedia.org/wiki/Chicago_Tylenol_murders

https://www.crimemuseum.org/crime-library/cold-cases/chicago-tylenol-murders/

https://www.chicagohistory.org/tylenol-murders/

https://www.cbsnews.com/news/tylenol-murders-investigation-new-dna-tests-40-years-later/

pbs.org/newshour/health/tylenol-murders-1982

The Excedrin Murders:

https://www.history.com/this-day-in-history/woman-convicted-for-tampering-with-excedrin

https://www.insider.com/woman-told-how-her-mom-was-killed-by-cyanide-poisoner-2022-11

https://murderpedia.org/female.N/n/nickell-stella.htm

https://www.lung.org/lung-health-diseases/lung

https://www.wcjn.org/Stella_Nickell.html

https://abcnews.go.com/US/story?id=93160&page=1     bv