A 39-year-old man has been arrested on suspicion of murdering a woman who was stabbed to death in a flat.
The Met Police said she was found seriously injured by emergency service workers at about 02:15 BST in Ravine Grove in Greenwich, south-east London.
Paramedics treated her for stab wounds at the scene but she died an hour later.
Officers are working to establish her identity and a post-mortem examination has not yet been held.
The arrested man remains in custody at a police station in south London.