This story was updated at to reflect new information:
Suffolk Police have referred themselves to the Independent Office for Police Conduct in connection with a murder investigation.
A woman was found stabbed at a property in Brickfields Avenue in Newmarket. She cied at the scene
Detectives are continuing to question a 28-year-old man arrested on suspicion of murder in Newmarket.
Due to the fact that there had been previous contact between the victim and Suffolk Constabulary prior to the incident, the matter has been referred to the for their assessment, in line with agreed protocols.
A cordon has been in place at the property throughout today and a road closure of Brickfields Avenue also remains in place.
The 28-year-old suspect is currently at Bury St Edmunds Police Investigation Centre, where he was taken for questioning.
The suspect and the victim were known to each other.