He dies before court date in St. Pat's sexcapade By HELEN PETERSON DAILY NEWS STAFF WRITER Wednesday, October 1st, 2003 A man who was expected to plead guilty yesterday to having sex in St. Patrick's Cathedral will have to answer to a higher authority. Brian Florence, 38, died of a heart attack Thursday in Alexandria, Va., his lawyer announced yesterday in court - surprising the judge and prosecutors. The news forced Manhattan Criminal Court Judge Barbara Jaffe to adjourn the case against Florence and girlfriend Loretta Harper, 36. The two were arrested inside the cathedral after being caught in the...