The inquest into the death of singer Amy Winehouse is expected to reveal details of her final hours when it reopens on Wednesday. The 27-year-old was found dead at her flat in Camden, north London, on July 23 following a lengthy battle with drug and alcohol addiction. However toxicology results showed there were no illegal substances in her body when she was found, according to her family. An initial post-mortem examination was inconclusive and no cause of death was given when an inquest was opened in August and adjourned until today. A family statement 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 "Results indicate that alcohol was present but it cannot be determined as yet if it played a role in her death." On Monday Scotland Yard admitted that a file outlining details of the soul star's death, which was meant to be sent to her family, may have been dispatched to the wrong address. Police said they were investigating the matter. The singer's father, Mitch Winehouse, told mourners at her funeral his daughter had "conquered" her drug addiction and was "trying hard to deal with her drinking". Earlier this month he said he planned to publish a memoir in the summer of 2012, entitled "Amy: My Daughter". The proceeds will go to the Amy Winehouse Foundation, which aims to help young people in Britain and abroad who struggle with addiction, ill health, disability or financial disadvantage. Winehouse rocketed to fame after winning five Grammy awards off the back of her 2006 second album "Back to Black" and famously sang about her refusal to seek treatment for her addiction in "Rehab". The inquest will be heard at St Pancras Coroner's Court, in central London.