A 22-year-old pregnant woman found dead in the hallway of her flat died from two gunshot wounds to the head, a post-mortem examination has found.
Paramedics pronounced Krystal Hart dead at the scene
Krystal Hart was pronounced dead by paramedics called to her home in Battersea, south London, on Friday.
Police said they are considering the possibility the death could have been related to a "neighbour dispute".
But they said they no longer believe the shooting was over a long-standing parking argument.
Police had said Ms Hart was believed to have been involved in a dispute over parking dating back "many months".
But after revealing the results of the post mortem examination, Det Ch Insp Colin Sutton said: "Whilst we continue to investigate the possibility that the murder could have been the result of a neighbour dispute, we no longer believe that this was over a parking matter".
No-one has been arrested over the killing. A neighbour who called police after the attack has been questioned, but was not under arrest and was being talked to as a witness.
Detectives have said they want to trace a white man aged between 30 and 50.
They have appealed for anyone who was in the area on Friday morning to contact them.