Spanish former Formula One test driver Maria de Villota is understood to have died from natural causes, according to sources close to the investigation into her death.
The 33-year-old was found dead in her hotel room in Seville, just a few days before she was due to present her book, detailing her life experiences.
De Villota, who lost her right eye in an horrific accident during testing in England in July last year, was one of only a handful of women to make it to the top of Formula One.
She was the daughter of the former F1 driver Emilio De Villota and was appointed as test driver for the Anglo-Russian team Marussia a few months before her crash.
The news of her sudden death has stunned Spain and the motor-racing world. After her crash, de Villota became an inspirational figure across the world for aspiring female drivers.