Given all that, does he fry?
And you've better stated my less-clear point. Even if one is completely and totally anti-death penalty (for whatever reasons), doesn't this particular 'one in a million' Darwin Award™ nominee make you re-think the reasons why, at least a little? Now, if we could somehow just get him to wear a helmet cam and then get to watch his life in prison 24/7, say on the WhattaMaroon Channel™, I could be persuaded to spare his useless life. I really wanna be watchin' the day somebody breaks their foot off in his ***.
Well, he sure worked hard to earn his Darwin, that much is certain. If you read more about the topic, he didn't just send that repulsive taunt letter to the DA -- though even that ought to be enough for an award -- he also did it to the victim's mother and sent a few letters full of hate in which he described the murder. Really put in some effort to not just incriminate himself, but to remove any trace of sympathy any judge or jury might have for him in the future.
So to answer the first question, yes, at this point it's pretty much a certainty that he's going to bite the dust.
That said, no, it doesn't really make me want to revise my opinion for the same reasons I too already wrote again and again:
1. Just because he's a hate-filled prick, doesn't mean there's not a very small chance that he's actually innocent and crazy.
Really, there is nothing in that confession of his that he hadn't heard in the interrogation and accusation before, or is impossible to verify outside of his taunt-letter-turned-testimony. There was no forrensic corroboration that there was a sexual attack on the first girl, for example, since that's the detail that'll earn him a dirt nap.
So, really, since you mentioned you'd want "confession and corroboration", in this case there's one half missing there.
2. The fact still is that the same laws will be applied to other people too, for which the evidence is even thinner. And in the wake of _this_, now the chance of getting the death penalty removed will be nil for the near future.
I'd rather just keep this scumbag in jail for life, than know that a few more innocents will be executed. He's taken out of the circuit one way or the other, so it's not even like those innocents are a price to pay for some actual gain (though I can't really relate to that line of thinkin either).
And I'd add:
3. In the end, all that's different between him and any other guy who gets the same penalty, is that this guy made himself completely repulsive. But I don't think that being rude, hate-filled or an idiot are things that warrant an execution. Or we'd have to rid the world of quite a few more idiots. Like about a billion at a wild guess.
So, no, on the whole it still doesn't make me start thinking that a system that executes innocents is a neat thing if it gets rid of this idiot too.