Considering his book had just been republished in October of 2001, his death could be considered suspicious. Amazon's review:
Editorial Reviews Book Description
The doctors who tried to save President John F. Kennedy at Parkland Hospital in November of 1963 agreed--either out of respect or fear--not to publish what they had seen, heard, and felt. Then in 1990, one of the Dallas surgeons who worked on JFK in Trauma Room One, Dr. Charles Crenshaw, decided after much deliberation that the American people ought to know the truth.
"The wounds to Kennedy’s head and throat that I examined were caused by bullets that struck him from the front, not the back, as the public has been led to believe," says Crenshaw. When the first edition of this book was published in 1992, under the title JFK: Conspiracy of Silence, Crenshaw revealed what he never had to opportunity to tell the Warren Commission. In the aftermath, the Journal of the American Medical Association (JAMA) called Crenshaw’s book "a fabrication." But JAMA’s claim did not hold up in court and Crenshaw subsequently prevailed in a defamation suit against JAMA. In the process, a number of new medical disclosures and discoveries have emerged on the startling medical cover-up of the JFK assassination.
Dr. Charles Crenshaw, decided after much deliberation that the American people ought to know the truth. How many times have we heard this recently? There's a pattern.
What kind of logic is that? The book has been out for a long time. Even if there was something new in the republished version, it is still out. Him being dead changes nothing.
The reality is that Dr. Crenshaw is just one more in a line of people who have tried to make something off their connection to this case, real or imagined. He lied in his book. He did not see what he wrote. He was not one of the doctors that treated Kennedy. The doctors that were there do not back him up.