Long time lurker, finally decided to post.
I have a few theories on this, but here's one I keep coming back to: I think Ray is in witness protection. I think he stumbled upon something big - maybe something that involved Centre County or the Commonwealth - and he felt like his safety was compromised, so he reached out to the Feds. It's almost impossible for a public figure to go into witness protection without those under investigation catching wind of it, so they did their best to make it appear like a walkaway. Where he is now, I do not know. But he went to Detroit, where one of the larger FBI regional offices is (and one that coincidentally specializes in public corruption investigations) as well as one of the larger US Marshal district offices (in fact, they are a block from one another). Why Detroit? Well, one of the larger district FBI and US Marshal offices, its close, and pretty much any other close city in Ohio or PA has him running the risk of being caught (since he spent time in both states). Spends a few weeks in Detroit, talks to investigators. At some point gets seen in Southfield. Now, he's living God knows where. But he hasn't come out of witness protection yet, because whatever case he's helping out with is still ongoing. I did some work with the FBI before, and even in the small case with which I was involved, the investigation has taken years. For a large RICO or public corruption case, it's not inconceivable for an investigation to take over a decade, especially if its targeting powerful people, because when the arrest warrants finally come down, the case has to be absolutely air-tight.
It's just a theory I have, but I feel like it's as good as any. It would explain why he was so intent on ensuring the data on his hard drive would NOT be able to be recovered, among other things. If it helps, the Wilkes-Barre office of the US Marshal handles that district's federal protective services. I think its been mentioned there was a sighting in Wilkes-Barre. Not sure if that's one that people considered credible or not.
Anyway, that's my theory. Regardless, I think it's safe to say that Ray went away, but in such a way that he did not want to be found, and went great lengths to ensure he wasn't found. What the reason would be, I do not know. But a former DA - from an area that has revealed itself to be more and more corrupt over the years - going into witness protection is not out of the realm of possibility.
This scenario would be more plausible to me if RFG's disappearance occurred closer to the time Sandusky was arrested. What else is currently going on or has gone in Centre County that approaches the level of scandal of the Sandusky/PSU mess?
After all, there is plenty corruption in all parts of the country and DA don't disappear into the witness protection program very often, if ever.
JMO