In this first episode of the series on Dealey Plaza witnesses, we'll hear from Harry Holmes, Mary Moorman and Jean Hill, and 4 people who said they saw a Secret Service agent on the grassy knoll immediately after the shooting: Officer Joe Smith, Constable Seymour Weitzman, Gordon Arnold, and Malcolm Summers; as well as Officer DV Harkness who saw someone who claimed to be Secret Service behind the School Book Depository right after the shooting. Follow us on Social Media: