[soah]

Folding the river seems terrible based upon the descriptions given. He took a long time to call a very small raise on the turn -- unless he was doing some bizarre acting, that's not a flush draw. And it was stated that he previously shoved in $2k "very quickly" with KK, so once again the long pause on the turn doesn't make sense. If he hit anything on the river, I actually wouldn't be surprised for it to be AK.

Of course, a bigger raise on the turn would have simplified the river action infinitely.

edit - forgot about his min-reraise on the flop. I guess that changes things slightly, especially with regards to the possibility of him actually having AK or something.