- Officers believe they know who the victim is and are looking for her relatives
- A 28-year-old man has been arrested on suspicion of murder
- Police say anyone with information should call the incident room on 020 8345 1570
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Arthur Simpson-Kent, 48, admitted killing Ms Blake and their sons according to his lawyer.
Tsvetomir Georgiev, 25, targeted women travelling late at night on the London Underground.