I don't think the info on Williams is that detailed, but in a cursory search it doesn't seem like it (moderately in depth report on his autopsy) - the question is would it have been reported in the media if it had, it's not like anyone has access to his autopsy, certainly impossible to find "intact hyroid" in any report because the media doesn't publish whats "right" with any case. At any rate, it is unlikely, and not reported, so probably not.