The music world has mourned deeply since Winehouse, 27, was found dead in her London flat on July 23. The talented singer and songwriter had wrestled for years with drug and alcohol abuse, but her father said at the time of her death that she had beaten her addiction to drugs.

"Toxicology results returned to the Winehouse family by authorities have confirmed that there were no illegal substances in Amy's system and the time of her death,'' spokesman Chris Goodman said in statement. "The family would like to thank police and coroner for their continuing thorough investigations and for keeping them informed throughout the process. They await the outcome of the inquest in October."

At the time of her death, Winehouse's father Mitch speculated publicly that his daughter's cold-turkey withdrawal from alcohol may have caused her death.

Winehouse's loss was felt deeply among musicians who knew the gifted performer and writer. "The thought that we won't hear any more of her music is too sad for words," George Michael said during a concert Monday in Prague before performing a cover of Winehouse's hit, Love is a Losing Game.