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).
A spokesman said the Metropolitan Police had “voluntarily referred matters” to the IPCC, adding that “it would be inappropriate to comment further”.
Ms Keza, who leaves behind a three-year-old daughter, was on the books at AMC Agency, which described the former Miss Africa contestant as a “very compassionate, amazing and a professional girl”.
“Today is a very sad day for AMC as we have had the sad news that one of our models, Linah Keza, has passed away in tragic circumstances,” the agency said in a statement.
“Anybody that has met and worked with her via the agency will miss her greatly.”
There was a further outpouring of tributes to Ms Keza on a special Facebook “Remembrance” page
Anita Karissa wrote: “RIP pretty lady, may God bless n strengthen ur lito gal thru ths n e rest of her precious life.”
Another, Priscy Jay, said: “R.I.p lenah. may God strength, most especially the little one.”
And Brens Willie Wambedde added: “Rest in Eternal Peace.”
Ms Keza’s brother, Jack Hodari, expressed his anger and said he hoped his sister’s killer would “know no peace and joy”.
A post-mortem examination is due to take place on Thursday at Walthamstow Mortuary.