Natasha Richardson did die from a blow to the head
The media types were right: Richardson died from a blunt impact, which ruptured an artery and caused an epidural hematoma. My Mom actually had that happen to her after a fall, but she had a smaller bleed, and it took a week for the severe trauma to develop. Fortunately, she responded to surgery that drained the site, although it took her probably a decade to recover from the trauma of coming so near to death.
That the media people ultimately proved to be right does not change the point I made early this week, which was that they leapt to a conclusion based on insufficient data.