Detectives are hoping toxicology results will shed light on the death riddle of a senior Tory in a Glastonbury Festival VIP toilet.
Christopher Shale, a close friend of David Cameron, was discovered slumped in a cubicle in the backstage area yesterday morning.
The Prime Minister's constituency chairman had been reported as missing by worried family members at 900-acre Worthy Farm on Saturday.
It is feared his body may have lain undiscovered for up to 10 hours. Police found his body as he was quoted in the Mail on Sunday bemoaning difficulties his party faced in recruiting new members.
He was reported to have written: "No reason to join. Lots of reasons not to."
Downing Street was understood to have contacted Mr Shale on Saturday to warn him that the note he had written had been leaked to the newspaper.
Mr Cameron said he was "devastated" as he descri bed Mr Shale as a valued friend and a "big rock" in his life.
Confusion reigned at the site after Michael Eavis said the wealthy businessman's death could be a "suicide situation".
But police dismissed the claim, with sources saying he was thought to have suffered a heart attack.
A police spokesman said: "The results of the post-mortem combined with the inquiries conducted into the circumstances surrounding the death indicate it is not suspicious.
"Therefore Avon and Somerset Police are not treating the death as suspicious.
"Further tests will be conducted to establish the exact cause of death."
Festival founder Mr Eavis expressed his "deepest sympathy" as the police probe was launched.
Mr Shale, 56, was staying with his family in a Winnebago surrounded by a host of celebrities and performers.
His body was being held at a local mortuary last night after an ambulance drove it through the crowds at the sun-drenched festival site.
Mr Cameron, the MP for Witney, said he and wife Samantha were great friends of Mr Shale's.
"Sam and I were devastated to hear the news about Christopher," the Prime Minister said.
The West Oxfordshire Conservative Association chairman was "a great friend and has been a huge support over the last decade" in the constituency, Mr Cameron added.
"A big rock in my life has suddenly been rolled away," he said.
A distraught woman, staying in the backstage area between the Pyramid and Other stages, was seen being comforted by officers shortly after the discovery at 9am.
Police confirmed several relatives were at the site.
Mr Eavis sent his thoughts to family and friends, before adding: "We work very closely with the police, medical and other emergency services to ensure that the festival is as safe as possible for all 170,000 people on the site."
A police cordon, patrolled by dozens of officers and security guards, was erected in the are a where festival production teams and some performers stay.
A host of celebrities were also camped in the vicinity, with Wayne and Coleen Rooney understood to have been staying in a nearby luxury RV.
Mr Shale and his relatives were apparently staying next to The Times columnist Caitlin Moran.
The writer tweeted: "Woke up to find the man in the Winnebago next to us died. Bit of a grime start to the morning."
Revellers reacted with shock as they were told the area was "a crime scene". Tom Waite, 35, from Cheddar, was among those staying in the VIP area.
He said: "It's just awful for his family."
Mr Shale was the chief executive of Oxford Resources Ltd, a cost reduction company based in Chipping Norton, Oxfordshire.
He was previously chief executive of MSG Communications. He is listed on the website of eurosceptic think-tank OpenEurope as a supporter and was a director of the Centre for Policy Studies.
Most revellers carried on part ying unaware as the festival came to a close in sweltering conditions, with more than 50,000 fans turning out for a performance from American star Beyonce.
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