"Roberts, one of President Kennedy's agents...had decided to switch to Johnson as soon as Kennedy was shot"
In addition, four other authors have noted Agent Roberts' "switch of allegiance," including DPD Chief Curry! Once at Parkland Hospital, SA Robert totally usurped his superior, number three man Roy Kellerman (on his first trip on his own for the first-time vacationing Gerry Behn, leaving Floyd Boring in charge of the Texas trip back in Washington, DC); Emory ordered Kellerman's agents around and confided in Rufus Youngblood, the soon-to-be SAIC, replacing the absent Behn (just as ASAIC Youngblood replaced SAIC Stu Knight in Dallas, and Henry Fowler re-placed the absent Treasury Secretary C. Douglas Dillon. For his part, Youngblood was to become the SAIC of the Vice-Presidential Detail on November 25,1963, a move planned before Dallas, but he rose much higher after Dallas).
What William Manchester reports as having occurred at Parkland on page 170 of his book makes one both sick and repulsed:
Powers and O'Donnell bounded toward the Lincoln. Powers heard Emory Roberts shouting at him to stop but disregarded him; a second might save Kennedy's life [Dave, too bad you weren't on the running board of the follow-up car...!]...Emory Roberts brushed past O'Donnell, determined to make sure that Kennedy was dead. “Get up” he said to Jacqueline Kennedy. There was no reply. She was crooning faintly. From his side Roberts could see the President's face, so he lifted her elbow for a close look. He dropped it. To Kellerman, his superior, he said tersely, “You stay with Kennedy. I'm gong to Johnson.”