Watch Cold Case: The Tylenol Murders 2r1k4c

Decades after the murders, a victim's daughter searches for justice — and uncovers forgotten evidence that s a controversial theory.

A key suspect maintains his innocence, even as authorities discover his suspicious past and possible motive. Tylenol unveils new triple-seal packaging.

After cyanide-laced Tylenol kills multiple people across Chicago, police and the media scramble to spread a nationwide warning.