casualty

noun

1. Something that happens by chance, especially an unfortunate event; an accident, a disaster.
2. A person suffering from injuries or who has been killed due to an accident or through an act of violence.
3. Specifically, a person who has been killed (not only injured) due to an accident or through an act of violence; a fatality.
4. A person in military service who becomes unavailable for duty, for any reason (notably death, injury, illness, capture, or desertion).