A 20-year-old man has been arrested on suspicion of murdering a woman in Ilford Lane, Ilford.
Mariana Popa, from Romania, was killed just before midnight on Monday of last week.
Police say that they believe she was a prostitute.
The man was arrested last night and remains in custody at an east London police station.
Officers continue to investigate the incident.
A post-mortem held at East Ham Mortuary found that Ms Popa died of shock, haemorrhage and stab wounds.
Anyone with information about the incident is still urged to come forward by calling 020 8345 3985 or, if you wish to remain anonymous, call Crimestoppers on 0800 555 111.
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