Rodney E. Miller, administrator and chief operating officer of Memorial Regional Hospital in Miami, has resigned from his $370,000 job after being the subject of a government investigation that found "fraud and mismanagement" at a Virgin Islands medical center he ran until last year. A report by the islands' inspector general said Miller had pocketed $1.3 million over five years "in excess of the amounts specified in the employment contracts." Frank Sacco, chief executive of the Memorial Healthcare System, said the system did all it could to check into Miller’s past, but Miller misled them in his application.