Summary

Portrait of Melville Fuller Melville Fuller Andersen v. United States — Opinion of the Court

But, as the accused told his story, he was not repelling violence; and, if the mate attempted to make use of the marline spike, it was simply in self-defense.
The case, as Andersen's testimony made it, afforded no basis for the introduction of evidence of prior provocation, or even of injuries previously inflicted, for no overt act on the mate's part provoked the evil intent with which Andersen sought him out on this occasion. Such evidence would not have been relevant, in view of the circumstances, as tending either to make out self-defense, or to reduce the grade of the crime.
Source: Wikisource

Portrait of Melville Fuller Melville Fuller Andersen v. United States — Opinion of the Court

If the testimony is admissible, it is upon the theory that it must tend to explain the situation as it then existed. He had turned to the mate to ask his protection from the captain. Now, if the mate had attacked him, it would be perfectly competent for Andersen to show that the mate, previous to this day, had threatened him, or had been cruel to him. We must look at the testimony as the witness has given it himself. It was the witness who sought the mate, and not the mate who sought the witness.
Source: Wikisource

Portrait of Melville Fuller Melville Fuller Andersen v. United States — Opinion of the Court

If the mate had been shot in the rigging, and fallen thence into the sea, an indictment alleging death by shooting and drowning would have been sustainable.
The government was not required to make the charge in the alternative in separate counts. The mate was shot, and his body immediately thrown overboard; and there was no doubt that, if not then dead, the sea completed what the pistol had begun.
Source: Wikisource

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