Youu2019d be charged with murder a second time. This was pretty much the exact plot of the execrable book and film Double Jeopardy which completely destroyed any resemblance to real jurisprudence for the sake of a soap-opera plot.The first trial was for a crime committed against a supposed victim at a specific time and location, and in a specific manner, which the jury or judge believed was proven beyond a reasonable doubt.The second trial would be for a crime committed against the same person, but at a different time, location, and (presumably) different manner. Even two of those three elements being different would defeat any claim of double jeopardy.That said, if youu2019re still in prison for the first murder, you have a pretty solid appeal on the grounds of impossibility, based on the new evidence of the person not being killed in the first place. But if you killed them a u201csecond timeu201d then youu2019re still guilty of murder and still likely to get the same sentence.