The article notes that "The remains of the late Henry Clapp, Jr., have been buried at Nantucket, his native place, under the direction of Mr. George S. McWatters, of a committee representing many acquaintances of Mr. Clapp in New York."
George S. McWatters, a New York City police officer, was the author of Knots United: Or, Ways and By-ways in the Hidden Life of American Detectives (Hartford: J. B. Burr and Hyde, 1871).
McWatters is identified as one of "the friends of Henry Clapp in the city of New York," but not necessarily a Pfaffian.