I believe this is the pimping rumor that made its way around a few months ago. Something along the lines of cash funneled to PSU in a scheme that had the Philly mob filming Second Mile kids getting sexually assaulted and selling said films to pedophiles around the world. Gricar would fit in as finding out about it and taken out by the mob. I'm not certain how Corbett fits in, although I believe he was part of the original investigation when he was the AG. Frankly, this rumor sounds pretty ridiculous with me, so I'm taking it with a bus-sized grain of salt.
There are also rumors about the way Spanier was managing money from the feds. Apparently there is a good chance that the feds are going to drop the hammer on the university because of it.