Arsema Dawit was knifed to death by Thomas Nugusse just three days after her 15th birthday in June 2008 at a block of flats in Waterloo.
Her family had reported him to the police around five weeks before she died, saying he had threatened to assault and kill her, but they did not feel their concerns were taken seriously enough by police.
Today an inquest heavily criticised the police for its handling of the case.
We support the jury's findings today and our thoughts remain with Arsema's family for their loss.
On Wednesday, 4 June 2008, two days after Arsema's death, a referral was made to the Independent Police Complaints Commission.
Officers had been made aware of the previous police contact and referred to the IPCC to investigate. However, due to criminal proceedings the IPCC investigation into police action was delayed until the matter had concluded at court.
The IPCC then took the decision to independently investigate the complaint.
The Met carried out two internal critical incident reviews of the case which were completed in August 2008 and the findings and recommendations shared with the IPCC.
The IPCC investigation made eight recommendations which have all been acted upon.
Commander Simon Bray said: "Arsema's murder was a tragic event and our condolences and sympathies remain, as always, with her family.
"We carried out our own reviews into the circumstances surrounding the murder. Work continues with an ongoing programme looking at the issues raised by this and other domestic abuse cases to ensure learning opportunities are identified and acted upon."
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