The official story of Dr David Kelly is that he took his own life in an Oxfordshire wood by overdosing on painkillers and cutting his left wrist with a pruning knife.
He was said to be devastated after being unmasked as the source of the BBC's claim that the Government had 'sexed up' the case for war in Iraq.
A subsequent official inquiry led by Lord Hutton into the circumstances leading to the death came to the unequivocal conclusion that Kelly committed suicide.
Yet suspicions of foul play still hang heavy over the death of the weapons expert whose body was found seven years ago next month in one of the most notorious episodes of Tony Blair's premiership.
Many believe the truth about the manner of Dr Kelly's death has never been established properly. Some even fear that the 59-year-old, the world's leading expert in biological and chemical weapons, was murdered.
Mystery: A new investigation into the death of weapons expert Dr David Kelly has revealed shocking new claims of a government cover-up
Of course, it would be easy to dismiss these sceptics as wild conspiracy theorists - but for the fact they include eminent doctors and MPs.
The blanket of secrecy thrown over the case by the last Labour Government has only fuelled the sense of mystery.
In January this year, it emerged that unpublished medical and scientific records relating to Dr Kelly's death - including the post-mortem report and photographs of his body - had been secretly classified so as not to be made public for 70 years.
Lord Hutton, who had been appointed by Blair, was responsible for this extraordinary gagging order, yet its legal basis has baffled experts accustomed to such matters.
Against this shadowy background, we have conducted a rigorous and thorough investigation into the mystery that surrounds the death of David Kelly. And our investigation has turned up evidence which raises still more disturbing questions.
Our new revelations include the ambiguous nature of the wording on Dr Kelly's death certificate; the existence of an anonymous letter which says his colleagues were warned to stay away from his funeral; and an extraordinary claim that the wallpaper at Dr Kelly's home was stripped by police in the hours after he was reported missing - but before his body was found.
Until now, details of Dr Kelly's death certificate have never been made public.
But the certificate was obtained by a group of leading doctors who have spent almost seven years investigating the case; doctors who believe it is medically implausible that he died in the manner Hutton concluded and are alarmed at the unorthodox way the death certificate was completed.
Near the top of all British death certificates is a box headed 'Date and place of death', in which a doctor or coroner should declare the exact location of a death, if it has been established.
Suicide? An aerial view of Harrowdown Hill, Oxfordshire, where Dr David Kelly's body was discovered in July 2003
Dr Kelly's certificate gives his date of death as July 18, 2003. It then states in reference to place of death: 'Found dead at Harrowdown Hill, Longworth, Oxon'.
Why was the word 'found' used? Why was the crucial question of 'place of death' not answered? The death certificate should be precise about the time, cause and location of death.
The doctors who have investigated the case believe the failure to answer this question leaves open the possibility that Dr Kelly died somewhere other than Harrowdown Hill, the wood where his body was discovered. If this was the case, they are concerned the law may have been subverted over Dr Kelly's death.
Any such irregularity would inevitably add to the pressure to reopen the case. Indeed, earlier this month it was revealed that Justice Secretary Ken Clarke and Attorney General Dominic Grieve, who have the power to undo Hutton's 70-year gagging order and demand a coroner's inquest into Dr Kelly's death, are poised to re-open the case.
To this day, the location where Dr Kelly died remains a mystery - yet it is surely the most basic requirement of an investigation into any violent or unexpected death.
Nor was the question of the location of death raised at the Hutton Inquiry.
Amazingly, Chief Inspector (now Superintendent) Alan Young of Thames Valley Police, who headed the investigation into Dr Kelly's death, did not even give evidence to the Hutton Inquiry.
Significantly, it emerged via a Freedom of Information request in 2008 that a police helicopter with heat-seeking equipment which searched for Dr Kelly on the night he disappeared did not detect his body.
Dr David Kelly leaving The House of Commons, Tuesday July 15, 2003 after giving evidence to the Commons select committee
At 2.50am on July 18, 2003, the helicopter flew over the exact spot where Dr Kelly's body was found by a search party less than six hours later, at 8.30am.
Yet the pathologist who took Dr Kelly's body temperature at 7pm on the day his body was found determined that Dr Kelly could still have been alive at 1.15am on July 18 - just 95 minutes before the helicopter flew over the patch of woodland.
If that was the case, the body would have been warm enough to be picked up by the helicopter's heat sensors. Why didn't the helicopter pick it up? Was it because Dr Kelly did not die where his body was found?
A full coroner's inquest, which, by law, must be held following any sudden, unexpected or violent death, would have addressed these discrepancies.
But no full inquest was ever held.
Oxfordshire Coroner Nicholas Gardiner opened an inquest on July 21. But on August 13 the then Lord Chancellor Lord Falconer, Tony Blair's former flatmate, ordered it to be adjourned indefinitely.
Falconer used an obscure law to suspend proceedings, and for the first time in English legal history he replaced an inquest with a non-statutory public inquiry to examine a single death, seemingly without any public explanation.
Search: It is claimed that on the night Dr David Kelly went missing, officers from Thames Valley Police removed wallpaper from his house
When we tracked Mr Gardiner down, he refused to say whether he was 'either happy or unhappy' about this decision, but he did admit: 'Public inquiries of this sort are very rare creatures. I think this was only about the third there had ever been.'
In fact, it was the fourth. Using a public inquiry to replace a coroner's inquest - under Section 17a of the Coroner's Act - in order to examine a death has only ever happened in three other cases. And in each case, it was where multiple deaths have occurred.
These were the incidents in which 31 people were killed in the Ladbroke Grove rail crash in 2000; the 311 deaths connected with Dr Harold Shipman; and the 36 deaths associated with the Hull trawler Gaul which sank in the Barents Sea in 1974 and whose case was re-opened in 2004.
The public was led to believe that the death of Dr Kelly would be investigated more rigorously by the Hutton Inquiry than by a coroner.
Conclusion: Lord Hutton's inquiry ended while the judge was still taking evidence from witnesses. Coroner Nicholas Gardiner, right, refused to say whether he was 'either happy or unhappy' that an inquest he opened was indefinitely adjourned
But it is now clear that the opposite was in fact true - for Hutton lacked the powers of a coroner. He could not hear evidence under oath; he could not subpoena witnesses; he could not call a jury; and he could not aggressively cross-examine witnesses.
© APConclusion: Lord Hutton's inquiry ended while the judge was still taking evidence from witnesses.
Astonishingly, on August 18, less than three weeks into the Hutton Inquiry, which opened on August 1, Dr Kelly's death certificate was mysteriously completed and the cause of his death officially registered as haemorrhage.
Put another way, five weeks before the Hutton Inquiry ended on September 24, 2003, and while the judge was still taking evidence about Dr Kelly's death from witnesses, the official record of the cause of death was written and the case effectively closed.
Misleadingly, the death certificate states an inquest did take place on August 14 - even though we now know no inquest actually happened. And extraordinarily, though it bears the signature of the registrar, it is not signed by either a doctor or a coroner as every death certificate should be.
Dr Michael Powers QC, a former coroner and an expert in coroner's law who is working to secure a full and proper inquest, said: 'This death certificate is evidence of a failure properly to examine the cause of Dr Kelly's death. It is evidence of a pre-judgment of the issue. In a coroner's inquest the cause of death would not be registered until the whole inquiry had been completed. As we see here, the cause of death was registered before the Hutton Inquiry had finished.
'This is remarkable. To my mind it is evidence that the inquiry into Dr Kelly's death was window-dressing because the conclusion had already been determined.'
Coroner Nicholas Gardiner refused to say whether he was 'either happy or unhappy' that an inquest he opened was indefinitely adjourned
Since January 2004 a group of doctors has worked unstintingly for a fresh inquest to be held into David Kelly's death because of the blatant shortcomings of the Hutton Inquiry.
They are radiologist Stephen Frost, trauma surgeon David Halpin, vascular surgeon Martin Birnstingl, epidemiologist Andrew Rouse and internal medicine specialist Christopher Burns-Cox. Their investigations have raised many doubts about the widespread assumption that Dr Kelly killed himself.
A letter they wrote to the Press in January 2004 marked the first time anyone had raised the possibility in the mainstream media of Dr Kelly's death not being a suicide.
In 2009 they spent almost a year researching and writing a medical report which disputes Hutton's assertion that Dr Kelly died from haemorrhage after severing the ulnar artery in his left wrist. The doctors argued that the wounds to Dr Kelly's left wrist would not have caused him to bleed to death.
In January this year they discovered that Lord Hutton made the extraordinary 70-year gagging order.
Since then they have asked via their lawyers Leigh Day & Co to see the classified records, but under the last Labour Government, the Ministry of Justice - the department which holds them - repeatedly denied them access in the run-up to the last General Election. No reason was given.
Liberal Democrat MP Norman Baker, who in 2007 wrote a book suggesting that Dr Kelly was murdered, used the Freedom of Information Act in January to apply to the Ministry of Justice to see the records.
His request was also denied. Using section 41 of the Act - known as an 'absolute exemption' - the ministry said it was not obliged to reveal the information.
Mr Baker, now a transport minister in the coalition government, has appealed against this decision. But he and the group of doctors are not the only ones who harbour suspicions about a cover-up of Dr Kelly's death.
Dr Kelly was discovered on Harrowdown Hill, next to woodland at the top centre left of the picture
Only last month one of the doctors, David Halpin, received an anonymous and carefully worded letter from someone claiming to be a relative of a former colleague of David Kelly's at the Ministry of Defence.
The correspondent said Kelly's colleagues were 'warned off' attending his funeral - presumably by MoD officials, although this is not made explicit.
Similarly, in his recently published book
The End Of The Party, the political commentator Andrew Rawnsley (who has close links with the Labour high command) claims that Geoff Hoon, Defence Secretary at the time of Kelly's death, was so furious about being removed by Tony Blair as Leader of the House of Commons in May 2006 that he wrote out a resignation statement.
According to Rawnsley, 'he planned to make a speech about the [David] Kelly affair that he told friends could trigger the instant downfall of the Prime Minister'.
Frustratingly, there are no more details in Rawnsley's book about what Hoon was referring to - but Hoon visited Dr Kelly's widow shortly after his death and has never publicly denied this explosive charge.
Equally inexplicable is the attitude of Dr Nicholas Hunt, the forensic pathologist who attended the scene when Dr Kelly's body was found on Harrowdown Hill.
Dr Hunt's duty as forensic pathologist is to help uphold the rule of law. In March 2004, after the Hutton Report was published, Dr Hunt contacted Channel 4 News and said he thought a full coroner's inquest should be held.
© ReutersBritish police officers guard a road leading to Harrowdown Hill near the home of Dr Kelly in Oxfordshire
Yet mysteriously, he says now that - despite contacting the TV station - he has 'maintained a silence on this [matter] on behalf of the [Kelly] family for a very long time'.
Adding further to the case for a proper inquest is a new fascinating claim by a woman who has also worked closely with the doctors and helped Norman Baker with his book.
Rowena Thursby, a former publishing executive who became fascinated with the case and started looking into it, told us that Dr Kelly's widow, Janice, admitted to her that on the night Dr Kelly was reported missing in July 2003 - but hours before his body was found -Thames Valley Police asked her and her daughters to leave their house and wait in the garden.
It later emerged that while the Kellys were outside, officers stripped wallpaper from their sitting room. Why would they have done that? Could they have been 'sweeping' his property for listening devices?
It is certainly a possibility. Despite the fact that the Labour government patronisingly dismissed him as a 'Walter Mitty character' and nothing more than a middle ranking official in the Ministry of Defence, Dr Kelly was arguably the world's pre-eminent expert on biological and chemical weapons of mass destruction.
We have established that he had access to the highest levels of the security services and was cleared to see the most highly classified intelligence.
The claim that police removed wallpaper from his house has never been confirmed or denied by Thames Valley Police - they refuse to make any comments about the Kelly case.
All these new revelations add weight to the list of unanswered questions surrounding Dr Kelly's death, such as why were no fingerprints found on the knife with which he allegedly killed himself - even though he wore no gloves.
As with the extraordinary details of the helicopter search, this vital information was only obtained using the Freedom of Information Act almost five years after the Hutton Inquiry ended. It was not heard at the inquiry.
The doctors insist that concern about Dr Kelly's death will continue to deepen until a full coroner's inquest is heard. If one is finally granted, many will expect Tony Blair and Lord Falconer to be called to explain under oath why they went to such lengths to avoid the normal, rigorous and respected course of this country's law.
Until this happens their reputations will continue to suffer, as will the reputation of the British legal system. The unavoidable conclusion must be that a full coroner's inquest is the only way the whole truth about the Kelly affair, however uncomfortable, will emerge.
© ReutersTragic: Dr David Kelly's grave at St Mary's church in Longworth, Oxfordshire. Several doctors argued that the wounds to his left wrist would not have caused him to bleed to death
Is unable to distinguish between friends and enemies because everyone is an enemy. And don't make public statements that endanger the 'path's plans. That's just signing your own death certificate.
Hutton must be a real piece of work.