I have already reviewed the 'original version' of this updated and expanded collection of nonsense elsewhere on Amazon, its initial incarnation was published as 'Conspiracy Of Silence'.
The following is taken from 'The Kennedy Assassination Home Page' internet website which is maintained by John McAdams. It is, in my opinion, the best website of its kind.
The piece below is taken from the 'Medical Evidence' section of the site.
It isn't clear who the author is, though I suspect that it may be John McAdams himself.
As wild as Crenshaw's most recent story is, it appears to have been toned down compared to the original. Harrison Livingstone, for example, has claimed that the first version of Crenshaw's manuscript had Johnson calling and demanding, not that Oswald be gotten to confess, but that Oswald be killed. The Kennedy Assassination Home Page has been unable to confirm the existence of that manuscript, but the early version of the story was as Livingstone describes.
One of the researchers who was privy to this early version was Gus Russo, author of Live By The Sword. As Russo describes it:
When Oliver Stone was in Dallas prepping for JFK, a number of us were around as "technical advisors," which was a bit of a joke, since Stone only listened to people with crazy conspiracy info.
One night at the Stoneleigh [Hotel], Stone was having a slew of top secret meetings in his suite with people like Ricky White, whom Stone paid $80,000 for his fraudulent story, and the positively goofy Beverly Oliver. That night, Stone ushered Gary Shaw, [Robert] Groden and Crenshaw into his room; I was not invited, but I pressed Shaw (Crenshaw's and Oliver's advisor) for info in the lobby. He was the first to tell me that LBJ ordered Oswald killed. Later, Crenshaw came down, and we happened to be in the Stoneleigh men's room at the same time, standing at adjacent urinals. It was there that he told me that Johnson had ordered the Parkland staff to "kill the son-of-a-bitch." It was decided to "drown Oswald in his own blood," i.e. transfuse him until his lungs collapsed. (E-mail to the author dated August 25, 2003)
Thus is appears that Crenshaw's absurdly incredible early version was tempered in an attempt to make it more credible. With many devout conspiracy believers, the tactic succeeded. For others, Crenshaw merely added to the long list of witnesses whose tall tales litter the assassination landscape.