I have to believe that the net is tightening around him. 40K isn't much, especially considering the 100K reward. It's a no-brainer; someone is going to turn on him. He doesn't seem like a very nice person (obviously), so if it comes down to complicity to felony murder (or aiding and abetting) or 100K, which would someone choose?
I also feel so good about the Metropolitan Police (esp. Chief Cathy Lanier) for confirming my faith in them. I never doubted that they were on top of the situation, and that they would crack this case wide open. It isn't over until it's over, but my kudos to MPD for a job well-done thus far!