Marie-Thérèse Joniaux

Marie-Thérèse Joniaux (née Maria Teresa Joséphe Ablaÿ; October 15, 1844 – 1923) was a Belgian poisoner who made headlines in 1894–1895 as part of the Joniaux Affair after the triple poisoning perpetrated against her sister, Léonie Ablaÿ, her uncle-by-marriage, Jacques Van de Kerkhove and her brother, Alfred Ablaÿ. She was sentenced to death on February 3, 1895. Her death sentence was commuted to life imprisonment, and she died in Antwerp in 1923.