Now, to the tragedy in that exclusive new york city neighborhood, horribly shocking to hear for any parent or caretaker. A mother coming home to find two of her children stabbed, allegedly by their... See More
Now, to the tragedy in that exclusive new york city neighborhood, horribly shocking to hear for any parent or caretaker. A mother coming home to find two of her children stabbed, allegedly by their trusted nanny. We want to warn you at home, this is an extremely disturbing story. Abc's john muller is on the scene on the upper west side of manhattan. John? Reporter: Amy, it is almost inconceivable. A parent's worst nightmare. A mom returns home from a swimming lesson with one child, to her beautiful manhattan apartment, to find her other two children stabbed to death. The nanny she trusted with their lives will soon be charged with taking them. Investigators are trying to figure out this morning what could have made a new york family's caretaker turn on the children she was paid to protect. Keep going. Reporter: Around 5:30 p.M. Thursday night, marina krim arrived home from a swimming lesson with her 3-year-old, to find a gruesome scene. Her other two children, 2-year-old leo and 6-year-old lucia krim, stabbed to death. Their nanny, lying next to them, in an apparent suicide attempt. On the floor of the bathroom is a nanny, who apparently has inflicted wounds on her throat. Reporter: Herbert klein lives next door and heard the mother screaming. She's crying out. What am I going to do with the rest of my life. I have no children. Reporter: Police escorted krim from the scene with her only surviving child. A sheet draped over their heads. The children's father an executive at cnbc was flying back from a business trip in san francisco and was notified when he arrived in new york. The nanny survived the wounds to her throat. Yoselyn ortega had reportedly worked for the family for about a year. Before that, marina krim had been a stay-at-home mom. "The new york post" is reporting that in the screening process, the family spent nine days in the dominican republic with her family before she was hired. Again, the nanny is in custody and in the hospital right now, in critical but stable condition. She has not been formally charged. As this investigation continues, a family continues to grieve, as well as an entire neighborhood.
This transcript has been automatically generated and may not be 100% accurate.