Criminal charges and trials lead to the popularity of difference between murder and manslaughter as a tag.
Both murder and manslaughter are homicide, the legal term for one person killing another person, whether lawfully or unlawfully. In the U.S. the difference between murder and manslaughter generally is something known as "malice aforethought." Murder requires malice aforethought but manslaughter is an unlawful killing without malice aforethought.
Malice aforethought generally exists if there is a conscious intent to cause death or extremely reckless indifference to the value of human life. Some states also have different degrees of murder or manslaughter, depending upon the nature of the act or recklessness.