A Post Mortem examination on the body of the 24-year-old man found dead at the festival took place this morning but gave "inconclusive" results.
Warwickshire Police say the death will continue to be treated as "unexplained" and that more tests will take place in the next few weeks.
Paramedics were called on Saturday after a man was discovered unconscious in a tent at the Long Marston Airfield near Stratford-upon-Avon.
Despite attempts to save him, the 24-year-old was declared dead at 4:40pm.
Festival organisers issued this statement at the weekend.
It is the first death in the history of the festival, which has taken place annually for the last 12 years. More than 50,000 were at the two day event, with an estimated 30,000 people camping on the Friday and Saturday nights.