The positions of coroners and constables both came to the United States from Britain. Corner, the root of which comes from the same root as crown – think coronet – was set up in 1134 to certify the death of an individual within a jurisdiction. The position of constable was also an import but the word is much older. The stable part of constable is from the Latin for, you guessed it, stable so the word actually means the count of the stable.
The United States still uses ‘coroner’. Think Patricia Cornwall’s Kay Scarpetta. But the office, and the requirements for, vary widely by state even now. Some require a forensics speciality, some just a physician. Some are appointed, some are elected. I suspect the results and the opportunities for abuse also vary from state to state.
Anyone who watches British TV knows about constables and all the ranks within the generic title. But even in the United States the early constables had the duties and privileges of a low level law enforcement officer – they have the power to arrest for example. In the era of my character Will Rees, constables (and the watch) were the agents of the law. The constables were under a Sheriff but in Colonial and early Federalist times there were few of those. In the District of Maine (Maine was not a separate state then but was a part of Massachusetts) there was only one Sheriff.
There are still constables in the U.S. but the duties vary widely. What happened? Well, in 1829, when the British Metropolitan Police were established, the states in the U.S. gradually adopted the model of a police force. And police officers took over the duties formerly assigned to the constable.