Just a reminder that many witnesses were intimidate into changing their original stories
?I told the FBI what I had heard [two shots from behind the grassy knoll fence], but they said it couldn?t have happened that way and that I must have been imagining things. So I testified the way they wanted me to. I just didn?t want to stir up any more pain and trouble for the family.?
? Kennedy aide Kenneth O?Donnell, quoted by House Speaker Thomas P. ?Tip? O?Neill Jr. in ?Man of the House,? p. 178. O?Donnell was riding in the Secret Service follow-up car with Dave Powers, who was present and told O?Neill he had the same recollection.