is this too weak with KK?

[PokerSparky]

That's a strange check by villain on the river. The ace seemed to scare him which would lead me to think my KK may be good. He might think his two pair just got counterfeited by AQ/AT etc. A river bet may have some value here.

its .5/1 on hollywood and i see all sorts of weird lines. As i type this, someone turned 2 pair, c/c'd and then c/rd the river