PokerStars No-Limit Hold'em, $0.50 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG+1 ($132.50)
givememyleg ($62.70)
MP2 ($68.85)
MP3 ($10.25)
CO ($54.85)
Button ($17.55)
SB ($15.10)
BB ($66.45)
UTG ($16.10)

Preflop: givememyleg is MP1 with A, A.
2 folds, givememyleg raises to $2, 2 folds, CO calls $2, 3 folds.

Flop: ($4.75) T, Q, 3 (2 players)
givememyleg bets $3.5, CO calls $3.50.

Turn: ($11.75) 8 (2 players)
givememyleg bets $8, CO calls $8.

River: ($27.75) K (2 players)
givememyleg .........

My image is tag, about 20/9 or so after 150 hands at this table. Villian is 20/4, decent player, been here about 100 hands. What's my play on the river after being called down on flop/turn?