Your Mom gets bi$%# slapped

[Your Mom]

Here is a hand that is an example of a player I can get absolutley no read on. Tell me how you deal with a guy like this.

Folded to CO-1 who calles, CO calls, I raise with AJs on the button, blinds fold, both limpers call.

Flop comes Ace, Nine, rag, no flush, no straight draws. Check, check, I bet, they both call.

Turn comes another card, still no flush or straight draws. Repeat the flop action.

River comes another card. check, check, I bet. CO-1 calls, CO folds. CO shows AKo and drags it.

Did I go wrong here, if so where did I go wrong? Thanks.