April 18, 1883 - Martha Wise

Martha Wise (née Hasel; April 18, 1883 – June 28, 1971) was an American poisoner and serial killer. After her husband died and her family forced her to end a relationship with a new lover, Wise retaliated by poisoning seventeen family members, of whom three died, in 1924.

Content sourced from en.wikipedia.org/wiki/Martha Wise under CC BY-SA 4.0.