Nick, it sounds like it's still unclear: did he fall from the crux on the second pitch, or the second crux on the first pitch?
Two more questions, if you will or if you even know this much: first, about the climber: did he seem to be aware of the possible hazards of his position? From what was said above, it sounds like he knew he was at the extent of his climbing ability, since he pulled on gear; but did he know he was off-route? did he know how far above the last piece he was? did he know he'd not clipped the last nut?
And second, was his belayer helping him to be aware of his position and gear and leg/rope interactions?