If you're quoting the data from theamericanheart.org, then you're mis-quoting the statistics. "According to recent estimates, nearly one in three U.S. adults has high blood pressure, but because there are no symptoms, nearly one-third of
these people don't know they have it." That would be one third of the one third or 1/9th. I'll concede that it is still a large number of people.
One other thing I'll throw into the mix

The woman died the day after riding mission space. Was that the only ride she was on all day? I would argue that it may have been the combination of all the days activities that may have led to her unfortunate passing.
But of course, I'm a fanatic and probably wouldn't know as much as others here.
Also according to the National Safety Council, In 2002...
767 people died of bicycle accidents (I hope the bicycle industry gets busy 'cause I haven't seen any dramatic safety improvement there!)
785 people died falling out of bed, off a chair, or other furniture.
128 people: overexertion, travel and privation