When pertaining to U.S Criminal Code: “the unlawful killing of a human being without malice. The two kinds of manslaughter are: (1) voluntary, “upon a sudden quarrel or heat of passion”; and (2) involuntary, “in the commission of an unlawful act not amounting to a felony, or in the commission in an unlawful manner, or without due caution and circumspection, of a lawful act which might produce death.” (U.S. Code: Title 18, Part I, Chapter 51, Section 1112) (Publication 114-38)
manslaughter
Variations: voluntary manslaughter, involuntary manslaughter