Top 10 most common ways of dying by age category.
Motor vehicle accidents are the leading killer of Americans under the age of 24. From 25 to 44 accidental death is most common, though the specific category of motor vehicle accidents is less frequent than dying from HIV, Cancer, or Heart disease.
There's also a neat graph showing the overall most frequent ways of dying. Heart disease (1 in 5), cancer (1 in 7), stroke (1 in 24), motor vehicle accident (1 in 84), suicide (1 in 119), falling (1 in 218), and finally firearms assault (1 in 314).
Additionally David Hemenway applies scientific method to the gun problem had some interesting thoughts on guns in the united states. Although crime rates in the US aren't that different than many other industrialized nation, apparently the ease of obtaining guns makes the the likelihood of a crime becoming deadly is significantly higher.