by contrast, death caused by active intervention is known as unnatural death. the "unnatural" causes are usually given as accident (implying no unreasonable voluntary risk), misadventure (accident following a willful and dangerous risk, which can include drug or alcohol overdose), suicide, or homicide. in some settings, other categories may be added. for example, a prison may track the deaths of inmates caused by acute intoxication separately. additionally, a cause of death can be recorded as "undetermined".