Anastasia Yeshchenko was murdered by her teacher-historian Oleg Sokolov. He was detained November 9, when he tried to drown in the river cut off the hands of his victim. The man was in an inadequate state, he was taken to the hospital with hypothermia. He later repented of the crime and issued a confession.

https://handofmoscow.com/2019/11/10/the-mother-of-the-murdered-teacher-of-graduate-students-arrived-in-st-petersburg/