Now, investigators are turning once again to DNA evidence to try to identify the person or people who did it, report CBS Chicago's Dave Savini, Samah Assad and Rebecca McCann.
On Oct. 28, 1982, CBS Chicago's Terry Anzur reported that Linda and her husband, DuPage County Judge Lewis Morgan, both touched the bottle.
Joe Janus, who lost his two brothers and sister-in-law, said he hopes DNA will help police arrest the killer.
"I'm assuming there's got to be some other DNA on that bottle," Laura said of the bottle her mother purchased in 1982.
Much of the evidence in the Tylenol murders is decades old and has been tested for DNA and fingerprints multiple times since 1982.
The purpose was to create timelines and track testing for key evidence, like bottles and capsules purchased by the victims.
Forty years later, Linda Morgan still feels lucky she ultimately decided not to take the Tylenol she purchased that day in 1982. »
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