I may be wrong, but I think the ban on murder is specifically delegated to the individual States as a State’s Right.
"Murder is the unlawful killing of a human being with malice aforethought. Every murder perpetrated by poison, lying in wait, or any other kind of willful, deliberate, malicious, and premeditated killing; or committed in the perpetration of, or attempt to perpetrate, any arson, escape, murder, kidnapping, treason, espionage, sabotage, aggravated sexual abuse or sexual abuse, child abuse, burglary, or robbery; or perpetrated as part of a pattern or practice of assault or torture against a child or children; or perpetrated from a premeditated design unlawfully and maliciously to effect the death of any human being other than him who is killed, is murder in the first degree."
I'm sure every state has a similar definition on the books. But like another poster said, state or federal doesn't matter, just ban it somehow.
You are wrong. The 14th amendment guarantees all persons within the jurisdiction of the United States protection of the law, nor can any state take a life without due process. Failure to ban murder would legalize killing without due process. States cannot sanction murder, but they do have jurisdiction over the punsihment, so long as it is enforced equally.