Hi this is my first post. It may be obvious to some, but your help is much appreciated. And any feedback in general is greatly appreciated! Sorry I have to type this in. I played at Bodog and no nothing about villain.

Hero (MP) $33.30 opens $0.65 w/ A5cc
call, call, fold, fold
Pot is $2.30
Flop 10c6c 9s
Hero bets $1.40 - CO & BT both call
Pot $6.50
Turn 2h
Checked by everyone
River 5d
Hero checks, CO bets $3.25, BT folds,Hero folds

Does CO check back turn if he already paired the board?