This scenario obviously makes sense to you, it makes very little sense to me for all the reasons I have previously stated. Anyone supremely confident that they have gotten away with it can happily get on their lives without a backward glance. As I said before, the media furore surrounding the case, which our protagonist had continually stoked with interviews, book serializations, crimewatch appearances, etc - none of that would have been necessary from the moment the case had been shelved. The protagonist would, a decade after the event have been a footnote in the public's and media's collective consciousness. I don't of course expect you to agree but my opinion is at least as valid as yours, so that'll do me.
We're making more progress, I think.
Now we have that your outcome is merely your opinion. I am happy to agree that your opinion is worth no less and no more than mine, ditto anyone else on the forum.
However, we are discussing a purely hypothetical scenario, so it is not really about opinion. It is about speculation, and creative thinking. A simple mental exercise that is telling us very little of worth.
You have constructed a thread that has produced, thus far, multiple alternative solutions. Why? Because real life evidence has been excluded.
I'm hoping the environment in Portelas will be conducive to running a murder mystery dinner party. This thread strikes me as being on a par - a jolly bash with no real consequence, but unfortunately minus the dinner.