Hmm gents...
I don't think a entire thread on this, whether it be a general inquiry of "Is he still alive?" or "Has he cheated me?" is warranted because we simply are not receiving his side of the story only your sides.
I feel it's best in the future if you do this:
1. Post a paid request, even if you know the coder post it in the paid request.
Why? Did you know your allowed to give feedback there? You can give feedback certainly just no rants or attempts at completely ruining the persons credibility but point being that's the place to provide constructive feedback where others can benefit from making up their own decision on how you were treated.
2. Testimonials and Portfolios can me made easily, did you actually visit these sites or even go so far as to use the "Contact Us" link and simply ask about his services?
Just because it says "Coder" or "Designer" or "Coder/Designer" under their name here does not mean we endorse them or that they are that, a simple release of a graphic can grant you "Designer" and a simple template edit listed as a modification can grant them the title "Coder" so you truly need to do your homework and research this individual or company providing services... of course some of the work might be over your head however your more then capable of doing research into the person your about to hire.
3. Excuses, be sure it's something simple... if you find the person explaining in detail then IMO run in the opposite direction.
The only excuse you ever hear from me is "I'm swamped" or "Extremely Busy" and that should be all imo otherwise whatever "Reason" they give you is simply a excuse in hiding. Death's, sick kids, other things may seem acceptable but how many of their friends do you think commit suicide each month? One for every client?

.
4. Pay up to HALF up front, why more?
That's perfectly acceptable, sensible, and cannot be argued as it's meeting someone half way. I prefer 100% up front payment however I can understand the hesitation in others but from a "Coders" point of view, I myself have also been cheated a few times by owners, so payment up front or at least half is a requirement for me.
Basically no matter what, you should not be going through something like this. Now I hope that this can be explained and no I'm not requiring a explanation I just felt the need to post that so perhaps others can benefit from some of my tips, I'm actually going to report the thread and see what the other staff members say about this as it should have been feedback on a paid request nothing more IMO even if your trying to contact him etc.
Sincerely,
Mike