Most commonly deaths notified to the coroner will be completely natural, however if the cause of death is not certain, an inquest will made.
INQUESTS & CORONERS
When a death is unexpected (sudden death), violent or unnatural, the cause of death is unknown or the person has died whilst detained in police custody/prison/detention centre, it is always referred to the Coroner who will determine if an investigation is necessary.
The majority of deaths notified to the coroner are completely natural, but it is a legal requirement in England & Wales and Northern Ireland that the cause of death is known and recorded.
Usually the coroner will speak to the nearest relative or their representative, as well as any doctors who have been looking after the person who has died, before deciding if a post-mortem examination is necessary.