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Linah Keza's killing is referred to the police watchdog after it emerges officers had previous contact with model and the suspect.
A murder investigation has been launched after Rwandan national Linah Keza was found dead by paramedics at an address in King Edward Road in Leyton, in the early hours of Wednesday.
Police were also called to attend the knife attack by the London Ambulance Service at around 4.30am.
A 38-year-old man was arrested in connection with the stabbing and is being questioned over the death at a north London police station.
Scotland Yard confirmed officers had had previous contact with Ms Keza and the murder suspect - and that the case had been referred to the Independent Police Complaints Commission (IPCC).