There were no illegal drugs in Amy Winehouse's system when she died, according to a statement made by her family on Tuesday. The family's spokesperson Chris Goodman said "toxicology results returned to the Winehouse family by authorities have confirmed that there were no illegal substances in Amy's system at the time of her death." The tests showed that "alcohol was present" but it wasn't yet clear if it caused the 27-year-old soul singer's death on July 23 when she was found in her London home. In the aftermath of the singer's death, her father Mitch Winehouse announced plans to start a foundation to help others with substance abuse, saying at her funeral that “If you cannot afford a private rehabilitation clinic, there is a two-year waiting list for help." Previously, The Sun newspaper reported that the Winehouse family believed her death was the result of abruptly quitting alcohol cold turkey. "They believe the singer's decision to lay off alcohol completely for three weeks was a lethal 'shock' for her tiny body... Her family believe she was killed by a seizure because her tiny frame could not cope with such a dramatic withdrawal." During her life, Winehouse publicly struggled with drug and alcohol abuse.