The pathologist who performed the autopsy on David Kelly said his death was a "textbook case" of suicide.
Speaking to the Sunday Times, Nicholas Hunt said he found no signs of murder on the former weapons inspector after an eight-hour examination.
The Home Office scientist also said he was horrified at the way the Labour government treated Dr Kelly, 59, who was identified as the source of a BBC story claiming the Government "sexed up" its now notorious dossier on Iraq's supposed weapons of mass destruction.
Mr Hunt said he would welcome a full inquest into Dr Kelly's death, called for by campaigners who question the suicide verdict recorded in the controversial Hutton Inquiry.
He told The Sunday Times: "I felt very, very sorry for David Kelly and the way he had been treated by the government...I had every reason to look for something untoward and would dearly love to have found something. It was an absolute classic case of self-inflicted injury. You could illustrate a textbook with it.
"If it were anyone else and you were to suggest there's something foul about it, you would be referred for additional training. I would welcome an inquest, I've nothing to hide."
Dr Kelly's body was found in woods near his Oxfordshire home in July 2003 as week after he was identified as the BBC source.
In the outcry that followed, Tony Blair appointed Lord Hutton to head a public inquiry into his death. Unusually, the then lord chancellor Lord Falconer ruled it should also act as an inquest.
Lord Hutton concluded Dr Kelly took his own life and that the principal cause of death was "bleeding from incised wounds to his left wrist which Dr Kelly had inflicted on himself with the knife found beside his body". He also found the scientist took an overdose of co-proxamol tablets - a painkiller commonly used for arthritis - and that he was suffering from an undiagnosed heart condition.
But there have been a number of calls for another examination of the case, most recently from a group of eight experts who wrote to The Times claiming Lord Hutton's conclusions were unsafe and former Tory leader Lord Howard.