Suzanne Greenway has stepped down from her position as assistant deputy coroner, just months after issuing a verdict of "death by misadventure", ruling that the 27-year-old had voluntarily consumed alcohol, risking the consequences.
Greenway, who was appointed by her husband, Coroner Andrew Reid, resigned in November, when authorities became aware that she had not been a registered UK lawyer for the five years required.
In a statement, Dr Reid said: "In November it became apparent I'd made an error in the appointment process. While I am confident that all of the inquests handled were done so correctly, I apologise if this matter causes distress."
However, the Winehouse family have said that they are "taking advice on the implications" of the news, adding that they are still to "decide if any further discussion with the authorities is needed".
Last week, Mitch Winehouse criticised a fashion collection by Jean Paul Gaultier, which had been inspired by his daughter.
"No-one asked us for permission or offered to make a donation to the foundation. This is purely about Gaultier making money, and that's wrong," he said of the show.
> Amy Winehouse tribute concert to be televised in summer 2012
Watch the video for Amy Winehouse's 'Our Day Will Come' below: