DCI Andy Partridge from the Met's Homicide and Serious Crime command tells ITV London they are still looking for witnesses to come forward to help solve the murder of Sabrina Moss.
Sabrina was shot on Kilburn High Street last Saturday while out celebrating her 24th birthday.
DCI Partridge said the Met want anyone who was in the area at the time to come forward, even if they think they only have a small amount of information - saying people "may not realise the significance of what they have seen".
Anyone with any information can call police on 101 or Crimestoppers anonymously on 0800 555 111.
More top news
Rob Young has run more than a marathon a day for the last 12 months.
The hospital where the Duchess of Cambridge is due to give birth has had a superbug outbreak.
The London Marathon brings together thousands of people raising money for charity - not to mention some rather unusual costumes.