Marina Krim returned home on Thursday with a third child to find her 2-year-old Leo and 6-year-old Lucia dead in the bathtub. Police say the nanny lay injured nearby with apparently self-inflicted stab wounds.
In one entry, Krim says that after dropping her two older children at school she cherished the "3 precious hours with little" Leo.
The nanny, Yoselyn Ortega, was found near a knife. She's hospitalized in critical condition.
Police Commissioner Raymond Kelly says it's unclear how long the nanny had worked for the family. No charges have been filed.