Why Did A Nanny Kill 2 Children in Her Care?

It has been five years since Marina Krim opened her bathroom door to a scene of unspeakable horror. Her two children, ages 2 and 6, lay in the bathtub, stabbed to death. The nanny she had trusted for two years to watch over them stood nearby with a knife, which she proceeded to plunge into her own neck. The nanny, Yoselyn Ortega, 55, had slaughtered the two children in her care in the via IFTTT