A POST-MORTEM examination on a man who died at Littlemore Hospital in Oxford has proved inconclusive, police said.
A man was arrested on suspicion of murder after the 34-year-old patient, who has not been named, was found dead at 7am on Saturday.
The death at the mental health centre is being treated as unexplained.
Oxford police spokesman Toby Shergold said: "We are awaiting the results of further tests."
A 25-year-old man has been bailed by police until January 8.
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