Not at all - but if you've already openly admitted to shooting (possibly killing) someone, then you've already pled guilty to a crime as it's described in the statutes. The only way that the shooting *wouldn't be a crime* is if you can provide a justification.
Yes, it's sort of a "catch-22" in that you have to confess to a crime before you can convince a jury that it wasn't really a crime, but it's not strictly the same as saying that someone is guilty until proven innocent.
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