In certain circumstances, a jury must be present at an inquest. Every person over the age of twenty-one years residing within a coroner's district is liable to serve on the jury at any inquest held within that district unless they are exempt.itnesses at an inquest. The Coroner decides which witnesses should give evidence at the inquest and the order in which they should give their evidence. Evidence must be presented so as to provide a logical sequence of the circumstances surrounding the death. The postmortem result establishes the medical cause of death.