Two young children stabbed to death by their nanny

October 25, 2012Upper West Side, New York, New YorkSiblings Leo and Lucia “Lulu” Krim (ages 2 and 6 respectively) are stabbed to death by their nanny WARNING: this article contains some details which may be considered graphic. Discretion is advised. Leo and Lulu’s mother, Marina Krim, took her 3-year-old to a swimming lesson and, at…