Legal Question in Criminal Law in North Carolina

Not in NC - there is no statute of limitation for murder or manslaughter.

In PA, see 42 Pa.C.S.A. � 5551:

A prosecution for the following offenses may be commenced at any time:

(1) Murder.

(2) Voluntary manslaughter.

(3) Conspiracy to commit murder or solicitation to commit murder if a murder results from the conspiracy or solicitation.

(4) Any felony alleged to have been perpetrated in connection with a murder of the first or second degree, as set forth in 18 Pa.C.S. � 2502(a) or (b) and (d) (relating to murder)

(5) A violation of 75 Pa.C.S. � 3742 (relating to accidents involving death or personal injury) or 3732 (relating to homicide by vehicle) if the accused was the driver of a vehicle involved in an accident resulting in the death of any person.

(6) A violation of 18 Pa.C.S. � 2702(a)(1), (2), (4) or (7) (relating to aggravated assault) if the accused knew the victim was a law enforcement officer and the law enforcement officer was acting within the scope of the officer's duties.

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You are going to have to either direct your question to other attorneys in their respective jurisdictions for the other 48 states or hire a law student to do the research for you.