I don't work in Florida, but things are pretty common to most states. The coroner or medical examiner determines, so far as possible, the means and manner of a death. The means is the physical cause. The manner is one from homicide, suicide, accidental, or natural. A coroner can revise a determination on the basis of the coroner's own medico-legal judgment. It's administrative and therefore not an adversarial matter, as in a trial. Coroner's sometimes conduct full formal courtroom type inquests with evidence presented and witnesses sworn, but more often make their determination in private. State laws often merely require an "inquest" without defining the term. I have, for instance, as an investigator, conveyed what I learned to a justice of the peace acting as coroner, and that communication was the "inquest" in an obvious natural death.
In most places, criminal authorities are not bound to accept the coroner/ME manner of death, but where there may be reason to change a verdict, it's usual to start with the coroner's verdict and amend that first. You obviously don't want to be trying someone for a criminal homicide without the coroner agreeing with you, if you can help it. But note that "homicide" isn't necessarily criminal. Lawful executions, for instance, are non-criminal homicides. The manner of death is a matter of the coroner's opinion. The threshold of proof is merely whatever it takes for the opinion to form. The publicly change that opinion, a coroner usually wants to be able to cite some additional evidence, rather than just rethinking what they knew the first time.
