EDIT: originally I stated that his Turn check behind "screamed" AK (maybe JJ or 99 or something), but it could also
have meant he had QQ, which was verified by the fact he raised me on the river...
(but at the time this all happened so fast and it failed to register in my mind...from one street to the next).

I agree his check sucked...I would have raised and he could have 3 -bet and I sure as heck wouldn't fold in that situation...

But would an expert player make the fold on the river there (either after the
raise or after the cap by the villian)?