[dropcap]M[/dropcap]inutes after the fatal shooting of President Kennedy on Nov. 22, 1963, Dallas police found a trio of unusually well-dressed tramps in a boxcar behind the “grassy knoll” and marched them single-file through Dealey Plaza.

Photographers snapped several pictures of the passing parade.  In the ensuing years,  the youngest and tallest of the three was identified by assorted laymen and at least one forensic expert as Charles Voyde Harrelson, a notorious killer-for-hire ...