As per Dr. Robert McClelland on a you tube interview -- Uncut interview -- JFK's Emergency Room Dr. Robert McClelland . At about the 9 minute mark , Dr. McClelland ask the other Drs. , Have you seen the back of his head ? The back right rear of his head is missing and McClelland says the wound in the right hand side of the back of JFK's head had about a 5 inch circumference .Dr McClelland and Perry were best of friends and Perry told McClelland that a person came up to him and cautioned him that he should not say anything .