A coroner's jury is a body convened to assist a coroner in an inquest, that is, in determining the identity of a deceased person and the cause of death. The laws on its role and function vary by jurisdiction.
In the United Kingdom, all inquests were once conducted with a jury. They acted somewhat like a grand jury, determining whether a person should be committed to trial in connection to a death. Such a jury was made up of up to twenty-three men, and required the votes of twelve to render a decision. Similar to a grand jury, a Coroner's Jury merely accused, it did not convict.
Since 1927, Coroner's Juries have rarely been used in England. Under the Coroners Act, 1988, a Jury is only required to be convened in cases where the death occurred in prison, police custody, or in circumstances which may affect public health or safety. The coroner can actually choose to convene a jury in any investigation, but in practice this is rare. The qualifications to sit on a Coroner's Jury are the same as those to sit on a jury in Crown Court, the High Court, and the county courts.
Additionally, a Coroner's Jury only determines cause of death, its ruling does not commit a person to trial. While grand juries, which did have the power to indict, were abolished in the United Kingdom by 1948 (after being effectively stopped in 1933), Coroner's Juries retained those powers until the Criminal Law Act 1977. This change came about after Lord Lucan was charged in 1975 by a Coroner's Jury in the death of Sandra Rivett, his children's nanny.