( CNN ) -- A grand jury indicted the nanny of two young children found stabbed to death in the bathtub of their Manhattan apartment for their murders , court documents show . Yoselyn Ortega , 50 , was arrested earlier this month and charged with the murders of Lucia Krim , 6 , and her brother Leo , 2 . Court documents released Tuesday show the grand jury indicted Ortega on first- and second-degree murder charges in both deaths . Police say on October 25 , the children 's mother , Marina Krim , returned to the family 's Upper West Side apartment , found Lucia and Leo dead in the bathroom and saw the nanny stab herself with a kitchen knife . A mother 's greatest fear . Ortega has been recovering since then at Weill Cornell Medical Center under police watch , and was still there as of Tuesday , according to hospital spokeswoman Linda Kamateh . Krim left two of her children with the nanny to take her 3-year-old child , Nessie , to a swim lesson at a nearby YMCA , New York Police Commissioner Ray Kelly said last month . She had expected to meet the nanny around 5:30 p.m. at a dance class , but when Ortega failed to appear she went back to the apartment . The late children 's father is Kevin Krim , a senior vice president for CNBC Digital and former Yahoo executive . A native of the Dominican Republic , Ortega had been a naturalized U.S. citizen for 10 years . Friends had introduced the family to Ortega , and she had worked for them since Leo 's birth two years ago , police said . Ortega was not a live-in nanny , but Marina Krim 's blog , `` Life with the Little Krim Kids , '' offered the loving mother 's view of a family life that included Ortega as a member . In February , the Krims traveled to the Dominican Republic , where they met Ortega 's family . `` We spent the past nine days in the Dominican Republic , '' Marina Krim wrote on February 18 . `` We spent half the time at our nanny , Josie 's sister 's home in Santiago and the rest at Balcones de Atlantico in Las Terrenas , a condo-style hotel where the 'Real Housewives of Dominican Republic ' and their families hang on weekends . It was wonderful . '' She added , `` We met Josie 's amazing familia ! ! ! And the Dominican Republic is a wonderful country ! ! '' One photograph showed the families together , Ortega holding the girl who was learning how to swim at the time her siblings were killed . CNN 's Kristina Sgueglia contributed to this report .
Was indicted in children 's murders , court documents say . Leo Krim had just celebrated his 2nd birthday . The children 's mother found them dead in the bathtub , they say .