An assassination of somebody presenting himself to the public as "John Fitzgerald Kennedy" [J-F-K] had been long-planned.
In addition to other evidence shown on this blog: The documentary movie "Fog Of War" included a scene wherein "J-F-K" was using the telephone while the hidden handler for "J-F-K" transmitted to "J-F-K" the following statement - - "My only reservation is [PAUSE] out".
"J-F-K" spoke exactly those words as he had heard via radio.
Somebody presenting himself to the public as "J-F-K" would be not going "in" to retire. As had been long-planned then the life of somebody appearing as "J-F-K" would be ended "out" instead of retired at "in".
/Nathan