Murder of the Krim siblings

Lucia and Leo Krim, aged 6 and 2 respectively, were murdered in the late afternoon of October 25, 2012, at the La Rochelle apartment building on the Upper West Side of Manhattan in New York City. The children's part-time caretaker, Yoselyn Ortega, was convicted of stabbing the children to death with kitchen knives while their mother Marina Krim and three-year-old sister Nessie were a few blocks away at a swimming lesson.

Source: Wikipedia — Murder of the Krim siblings (CC BY-SA 4.0)