Sarah Jane Robinson

Sarah Jane Robinson (née Tennant; May 26, 1838 – January 3, 1906), known as The Boston Borgia, was an Irish-born American serial killer who poisoned her family members and other people from 1881 to 1886, with the help of her accomplices Thomas R. Smith and Dr. Charles C. Beers. She was initially sentenced to death for the poisoning of her brother-in-law, but the verdict was later changed to life imprisonment, with Robinson dying behind bars. Provided by Wikipedia