I found the following at an updated copy of his Wikipedia page:
Quote:
John Gresham, a co-author and researcher with Clancy on several books attributed Clancy's death to heart problems: "Five or six years ago Tom suffered a heart attack and he went through bypass surgery. It wasn’t that he had another heart attack, [his heart] just wore out.
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Hopefully it will put any conspiracy theories still floating round out there to rest.