c. 265, § 3
Duel; wound without and death within state; venue
Official text prohibited actmental stateif conditionpenaltylegal term
An inhabitant or resident of this commonwealth who, by previous appointment or engagement made within the same, fights a duel outside its jurisdiction, and in so doing inflicts a mortal wound upon a person whereof he dies within the commonwealth shall be guilty of murder within this commonwealth, and may be indicted, tried and convicted in the county where the death occurs.
Simplified explanation
A Massachusetts resident who arranges a duel here, fights it out of state, and mortally wounds someone who dies in Massachusetts is guilty of murder here; the punishment is set elsewhere.