Police are investigating claims that a mentally ill patient died after he was given painkillers to subdue his behaviour.
Bolton, Salford and Trafford NHS Mental Health Trust has suspended three members of staff after the 77-year-old man died at Woodlands Hospital in Little Hulton, Greater Manchester, last Thursday.
The matter is now being investigated by Greater Manchester Police and detectives are awaiting the results of a post-mortem examination.
The trust said that five days before the man died they had been made aware of "clinical concerns" involving patient care on his ward, and had taken immediate action. A helpline has been set up by the trust as a result of the claims.
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