Yoselyn Ortega Update: NYC nanny accused of killing 2 children hears voices, psychiatrist testifies

(CBS) NEW YORK - Yoselyn Ortega, the New York City nanny accused of murdering two young children in her care last fall, says she hears voices in her head that talk about killing people, according to a psychiatrist who testified in a competency hearing on Monday, CBS New York reports. 

PICTURES: Nanny charged in fatal stabbings of 2 NYC kids

Karen Rosenbaum reportedly testified that the 50-year-old Ortega did not understand why she was handcuffed to her hospital bed or why police were outside her room in the months after the murders.

"She hears people coming into her room at night," Rosenbaum testified, adding that Ortega complains that they say things that frighten her, like, "we're going to kill a lot of people."

The psychiatrist also says Ortega, who has a history of depression and anxiety, failed to tell a doctor about the voices because she didn't want people to think she was crazy.

On April 5, Manhattan Supreme Court Justice Gregory Carro ruled that Ortega was fit to stand trial after two mental health professionals found that she could assist in her defense in a meaningful way. Those findings have since been challenged by the defense.

The defense argues Ortega does not understand the charges against her and has no recollection of what happened.

Police said they found Ortega last October in the bathroom of her employer's Upper West Side apartment with self-inflicted stab wounds. The bodies of 6-year-old Lucia Krim and her 2-year-old brother, Leo, were in a pool of blood nearby.

Oretega is charged with two counts each of first-degree and second-degree murder. She has pleaded not guilty. Her sister has said she loved the children and is a peaceful woman.

Complete coverage of the Krim Murders on Crimesider