A cardiologist, who was sacked after becoming a whistleblower, has been cleared of any wrongdoing.
Dr Raj Mattu spoke out about two patients dying in overcrowded bays at Walsgrave Hospital in Coventry in 2001.
The NHS Trust which runs the hospital says it is considering appealing the tribunal's decision.
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A woman killed her own mother through gross negligence after she left her sitting in a chair for up to one year.