Humans are the only living species in the Homo genus...
Murder is the unlawful killing, with malice aforethought, of another human being, and generally this state of mind distinguishes murder from other forms of unlawful homicide...
, for example, is a type of homicide. It can also describe a person who has committed such an act, though this use is rare in modern English. Homicide is not always a punishable act under the criminal law, and is different than a murder from such formal legal point of view.
Criminal homicide takes several forms and includes certain unintentional killings.