The 'Rocket Man' singer spent two nights in intensive care after becoming "violently ill".
The coroner investigating James Horner's death has declared it to have been an accident.
James Horner's plane crashed in Venture Country, South Carolina, at 9.30am local time on Monday. Firefighters had to be called to put out the flames and his body was badly burnt.
However the medical examiner Zeb Dunn has conclusively identified the body as Horner and stated that the cause of death was "blunt force trauma."
Horner was famed for his magnificent movie soundtracks, and won an Oscar for his score to 1997's Titanic. He also worked on Avater, Braveheart and A Beautiful Mind.