Which crime involves causing the death of another person unlawfully?

The act of causing the death of another person unlawfully is defined as manslaughter. This term encompasses situations where someone may not have intended to kill, but their actions were reckless or negligent to such a degree that it resulted in someone else's death. Manslaughter is distinguished from murder primarily by the absence of premeditation and intent to kill.

In contrast, assault refers to causing physical harm to someone without the intent to kill, while burglary involves entering a building unlawfully with the intent to commit a crime inside, typically theft. Larceny is the act of unlawfully taking someone else's property with the intent to permanently deprive them of it. Each of these other crimes focuses on different legal elements and consequences that do not include the unlawful causing of death. Thus, manslaughter specifically aligns with the description provided in the question.