A fourth person was arrested by detectives on Tuesday (November 8) investigating the death of a 40-year-old man.
Two men and a woman arrested after the discovery of the victim's body in Luther Court, off Speedwell Street, Oxford, on Sunday have been released on police bail.
The victim, who has not been formally identified, was found after police were called to flats in the city centre street at 1.10pm for another incident, police spokesman Vicky Evans said. A post mortem examination proved inconclusive as to what the cause of death was, and further tests to determine what killed him were being carried out, she said.
News of the man's death was only released by police on Monday afternoon.
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