A 39-year-old Uzbek woman Gulchehra Boboqulova has pleaded guilty to murdering the four-year-old Russian girl suffering from cerebral palsy that was in her care.

Gulchehra Boboqulova went on trial in Moscow on October 24.

Recall that Boboqulova was detained in February this year after she waved the severed head of a child outside a Moscow subway station.

Citing Moscow law enforcement authorities, Russian media outlets reported that Russian authorities detained a nanny dressed in conservative Islamic dress on February 29, 2016 after she waved the severed head of a child that was in her care outside the Oktyabrskoye Pole (October Field) subway station in northwest Moscow.

The niqab-clad woman is shown holding the child’s head aloft near the subway station, according to graphic video footage, released by news organization Life News.  In the footage, she shouts: “I am a terrorist.”  The woman could be heard shouting “Allahu Akbar” (God is Great) as she waved the child’s head.

Police reportedly identified the woman as a native of Uzbekistan named Gulchehra Boboqulova.  Investigators said she killed and beheaded the child and then set fire to the family's apartment and fled.

Moscow’s Investigative Committee said in a statement: “According to preliminary information, the child's nanny, a citizen of Uzbekistan born in 1977, waited for the parents and elder child to leave the apartment and then, for reasons not established, murdered the infant, set fire to the flat and left the scene.”

Physicians certified Boboqulova mentally incompetent, and the Investigative Committee proposed to send her for compulsory treatment.

Interviews in the Russian media with people who claimed to have known Boboqulova in her native Uzbekistan alleged that she was known to be mentally unstable and had been treated for schizophrenia in the past.