Last weekend, Yoselyn Ortega was formally charged with first- and second-degree murder for allegedly killing Lucia Krim, 6, and Leo Krim, 2, the children she cared for on the Upper West Side. While a motive has not been given, it's been suggested that she was upset with her employers, Marina and Kevin Krim, over pay. One report also says that Ortega had an "epic argument" with Marina Krim the day before the killings.

Police say that the children's mother, Marina Krim, who had been with her third child (six-year-old Nessie), found her daughter's and son's bodies on October 25. Cops also say that then Ortega started to stab herself with a kitchen knife. Lucia and Leo died at the hospital, while Ortega survived her injuries, though had remained intubated until this past Saturday.

According to Radar Online's source, who commented about Ortega's interview with the NYPD, "Yoselyn also said that when she left at the end of the day before the murders, Marina ignored her when she said good-bye and this made her very, very angry. Yoselyn became extremely animated when she discussed the incident with law enforcement. Yoselyn also said she had numerous disagreements with Marina about how the kids were being cared for. Marina didn't think Yoselyn was interacting with the kids enough and was giving them junk food when she was out of sight."

A law enforcement source also told Radar Online that Ortega has been essentially badmouthing Marina Krim during interviews, "When Yoselyn began working for the Krims they also had a housekeeper and Yoselyn said that she didn't like the way that Marina spoke to her. It was obvious Yoselyn was trying to portray her in a bad light."

Relatives for both the Krims and the Ortegas have expressed shock at the tragedy, saying that the Krims had a close relationship with Ortega, even visiting and staying with her family in the Dominican Republic. Today, the Daily News reported that Valerie Van Leer-Greenberg, who has represented Robert Chambers in the past, will represent Ortega, who is still under guard at a hospital.

A memorial for the two children was held on Monday at Avery Fisher Hall. Security was tight, apparently because of the Krims' surviving child, Nessie. Kevin Krim's mother said, "I have seen [Nessie] and she will be fine, she has wonderful parents... She will have lots of love and will be fine... Under the circumstances, we are all doing as well as can be expected."