Washington Revised Code Title 9A. Washington Criminal Code § 9A.32.055. Homicide by abuse

(1) A person is guilty of homicide by abuse if, under circumstances manifesting an extreme indifference to human life, the person causes the death of a child or person under sixteen years of age, a developmentally disabled person, or a dependent adult, and the person has previously engaged in a pattern or practice of assault or torture of said child, person under sixteen years of age, developmentally disabled person, or dependent person.

(2) As used in this section, “dependent adult” means a person who, because of physical or mental disability, or because of extreme advanced age, is dependent upon another person to provide the basic necessities of life.

(3) Homicide by abuse is a class A felony.