How much manslaughter is due to alcohol use?

Alcohol contributes to approximately 56 percent of violent deaths including motor vehicle crashes, homicides, suicides, drownings, poisonings, assaults, falls, fires, burns, and firearms discharges among people aged younger than 21 years according to a research by Dr. Harold Holder and colleagues from the National Institute on Alcohol Abuse and Alcoholism (NIAAA), National Institutes of Health, Bethesda, Maryland.