The coroner who oversaw the inquest into the death of singer Amy Winehouse has resigned after her qualifications were questioned, her boss said yesterday -- raising the possibility the investigation may have to be held again, The Associated Press reports.

Winehouse's relatives said they were still absorbing the implications of the news and were seeking legal advice.

In October, Suzanne Greenaway ruled that the soul singer, who was found dead at her London home in July, had died from accidental alcohol poisoning.

Greenaway had been appointed an assistant deputy coroner in London in 2009 by her husband, Andrew Reid, the coroner for inner north London. But she resigned in November after authorities learned she had not been a registered British lawyer for five years as required by the rules. She had practiced law for a decade in her native Australia.

Her resignation was not made public until yesterday.

Reid apparently broke no laws in appointing his wife but could have breached professional guidelines. Greenaway was one of several deputy assistant coroners.

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