Daniel Morgan, a private investigator, was killed in 1987
The prosecution of a former Metropolitan policeman for attempting to pervert the course of justice in a murder investigation has been stayed.
Sidney Fillery, 63, from Norfolk, a former detective sergeant, has been discharged at the Old Bailey.
He had pleaded not guilty to the charge which alleged he threatened a potential witness in relation to the 1987 murder of private investigator Daniel Morgan.
Four other men are due to face trial in September charged with murder.
Mr Morgan, 37, a father-of-two from Monmouthshire, was found with an axe embedded in his skull outside the Golden Lion pub in Sydenham, south-east London, on 10 March, 1987.