British singer Amy Winehouse had more than five times the legal driving limit of alcohol in her blood when she died on 23 July aged 27.
The Rehab and Back to Black singer had 416mg of alcohol per 100ml of blood, according to the findings of an inquest into her death, compared with the legal driving limit of 80mg.
A hearing in London also learned that Ms Winehouse, who battled drug and alcohol addiction throughout her brief but successful career, had not drunk alcohol in July until the day before she died.
The findings backed reports shortly after her death that the Grammy award-winning artist had been trying to deal with her addiction but ran the risk of complications from binge drinking.
A security guard checked on Ms Winehouse at 10am on the day she died at her house in Camden, north London, and thought she was asleep.
He checked again at 3 pm and called the emergency services.
The inquest ruled that she had died of "misadventure".
Members of her family, including her father Mitch, were present at the inquest, but made no comment to awaiting media as they left.
They later issued a statement saying it was "some relief" to find out what had happened to Ms Winehouse.