In his book Behold a Pale Horse, Bill Cooper claims that the driver of the limousine, William Greer, shot President Kennedy.
In the film Executive Action (1973), about the assassination of President Kennedy, the name of the actor who gives the order to kill President Kennedy is Will Geer. Coincidence?! (Will Geer played Grandpa Walton).
Limo Driver Delivers Final JFK Shot (pages 29 to 32)
http:// phoenixarchives.com/liberator/1992/0792/070792.pdf