Three men and a woman have now been arrested on suspicion of murder after a woman died following an incident at a house in Derby.
After officers arrived at a Moss Street house at 2.30am Saturday to find a 33-year-old woman injured, they launched a murder investigation.
Later that day, she died at Queen’s Medical Centre.

After officers arrived at a Moss Street house at 2.30 on Saturday to find a woman in distress, the police launched a murder investigation.
Family members of the victim were informed by police about her death.
The investigation is being pursued by detectives.
Derbyshire Police stated that they will increase their presence on the roads in the next few days.
They asked for any additional information to be provided.
Crimestoppers is an independent charity that can be reached anonymously at 0800555111.