Amy Winehouse was more than five times the UK legal drink drive limit when she died.
The British singer was found dead in her London home in July, aged 27. Toxicology tests determined there were no illegal substances in her system when she passed away.
The inquest into her death reopened in London today and heard she had 416mg. of alcohol in every 100ml. of her blood when she died.
The British alcohol limit for driving is 80mg.
The inquest has recorded a verdict of misadventure in relation to the star's death.
The St Pancras Coroner's Court in London has also heard Amy had been sober throughout July. The first day she drank alcohol during the month was on Friday 22, the day before she was found dead in bed.
The singer's father Mitch Winehouse and his wife Jane arrived at the court earlier today. He was dressed sombrely in black while his spouse was in grey.
The court was told Amy's security guard Andrew Morris checked on her at 10am on July 23, but thought she was asleep. He left her alone for five hours, before returning at 3pm and realising she hadn't moved.
Amy fought a highly-publicised battle with drink and drugs. After her death many suspected she had suffered an overdose, although toxicology tests proved that was not the case.
Her family have previously claimed it was likely she had passed away after a seizure, as she had often suffered from them. Mitch has said she was trying to give up alcohol at the time of her passing.
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