A group of experts including a coroner and a professor of medicine are demanding a full inquest into the death of government weapons inspector David Kelly.
They have described the official cause of death - that Dr Kelly bled to death after slashing his wrist - as "extremely unlikely" in the light of evidence since made public.
The call for an inquest comes in a letter to The Times signed by eight senior figures including a former coroner, Michael Powers.
The scientist was found dead in woods near his Oxfordshire home in 2003 after he was exposed as the source for a BBC story claiming an intelligence dossier about Iraq's weapons capabilities had been "sexed up".