“Since the CDC began publishing data in 1981, gun suicides have outnumbered gun homicides. But as gun homicides have declined sharply in recent years, suicides have become a greater share of all firearm deaths: the 61% share in 2010 was the highest on record. That year there were 19,392 suicides by firearm compared to 11,078 homicides by gun (35% of all firearm deaths). The rest were accidents, police shootings and unknown causes.”
PEW RESEARCH CENTER
http://www.pewresearch.org/fact-tank/2013/05/24/suicides-account-for-most-gun-deaths/
Notice how any other death at the hands of another human is a homicide, but police shootings are counted outside that number.