Though not nearly as famous as many listed above, the death of steel tycoon and socialite Eben Byers by "bad medicine" is certainly more conclusive than some you've listed (Plath's in particular is highly debatable.)
Spoken like a old-school XCOM fan!
Whenever I see an article about pain and pain relief, I am reminded of the incredible work of Dr. Paul Brand, who greatly advanced our understand of both leprosy and "the gift of pain".
Obligatory reference.
If Punky Brewster made the cut, I can't believe you didn't include "The Monster of Walnut Grove" episode of "Little House on the Prairie"!
Harriet Oleson's decapitated head served to Laura Ingalls for dinner. And it CAME TO LIFE!