888 Poker - $0.06 NL (6 max) - Holdem - 5 players

SB: $2.06
BB: $6.55
UTG: $1.75
Hero (CO): $12.50
BTN: $6.52

SB posts SB $0.03, BB posts BB $0.06

Pre Flop: (pot: $0.09) Hero has K A

fold, Hero raises to $0.18, BTN calls $0.18, fold, fold

Flop: ($0.45, 2 players) 5 T Q
Hero bets $0.24, BTN calls $0.24

Turn: ($0.93, 2 players) K
Hero bets $0.69, BTN calls $0.69

River: ($2.31, 2 players) A
Hero checks, BTN bets $1.73,

Hero??