There are fresh calls for a formal inquest into the death of Government scientist David Kelly.
A group of doctors have produced a report arguing that the Hutton Inquiry's finding of suicide was flawed and have handed it to lawyers preparing a legal challenge.
Dr Kelly's body was found six years ago on Friday in woods near his Oxfordshire home after he was exposed as the source of a BBC report on the grounds for going to war in Iraq.
Instead of a coroner's inquest, Lord Hutton was asked by then Prime Minister Tony Blair to conduct an investigation. His inquiry concluded the 59-year-old died from blood loss as a result of cutting his wrist with a blunt gardening knife.
According to the team of 13 specialist medics, however, a cut to the ulnar artery was "highly unlikely" to have caused enough bleeding to kill Dr Kelly.
One of the authors, retired consultant in orthopaedic and trauma surgery David Halpin, said previous examinations into Dr Kelly's death were "flawed" and the Hutton inquiry did not have the same legal standards as a coroner's inquest.
He said: "Due process has been subverted. The group that I am part of is not prepared to let that go. There is evidence of a cover-up."
Mr Halpin added: "He was a very prominent germ and chemical warfare expert. That is relevant because of his knowledge of the biology of death.
"He had spent ten years at (Government laboratory) Porton Down and he knew everything about killing things.
"So to take what was said to be a blunt knife and what was alleged to be his wife's co-proxamol tablets to try to kill himself is extraordinary. I think it's highly likely he was assassinated."
Liberal Democrat MP Norman Baker, who published a book about Dr Kelly's death two years ago, said: "There are three aspects of 2003 which need to be put to bed.
"There needs to be a proper inquiry into the Iraq War, there needs to be a proper inquest into Dr Kelly's death and there needs to be some recognition of his outstanding work. All we are asking for is proper legal process - we have not had it yet."
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