According to the US Centers for Disease Control and Prevention. A natural cause of death is anything that isn’t a non-natural cause of death. When people kill themselves, are killed by someone else, or die as the result of an accident, that is considered non-natural. Any other cause is “natural.”
Accidents accounted for two-thirds of all non-natural deaths in 2013
(most recent results available). The most common type of accident
was accidental poisoning, at 20 percent of all non-natural deaths,
followed by motor-vehicle accidents at 18 percent of all non-natural
deaths, and falls at 15 percent.
Suicide, by whatever means accounted for more than twice as many
deaths as homicide. Firearms specifically are used in almost twice
as many suicide deaths (21,175) as homicide deaths (11,208).