The cause of death for Cranberries lead singer Dolores O’Riordan, who died Monday in London at age 46, will not be revealed until at least April.

The U.K. publication The Guardian provided a few new details today about O’Riordan’s death, citing London coroner’s officer Stephen Earl.

According to Earl, O’Riordan was found “unresponsive” at a hotel on Park Lane in central London. Earl spoke today at the opening of the inquest at Westminster coroner’s court.

“The London ambulance service was contacted and verified her death at the scene,” Earl said. “Subsequently, the Met police attended and they determined the death to be non-suspicious.”

Earl noted that a postmortem examination has been carried out — the court is waiting for test results.

“The coroner, Shirley Radcliffe, adjourned the hearing until 3 April, when a date for the full inquest will be set,” The Guardian reports.

O’Riordan, from Friarstown, County Limerick, in the Irish Republic, was in London to record a cover of the Cranberries’ hit song “Zombie” with the hard rock band Bad Wolves, The Guardian notes. She is expected to be buried in her native Ireland.

O’Riordan’s family may be notified about the test results ahead of the April 3 hearing, and would have the option of publicly releasing the information before the official findings are released by the coroner’s office.