NL20 SH Speed 99, Overpair Facing 3 Barrels

IPoker, $0.10/$0.20 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

SB: $20.10 (100.5 bb)
BB: $24.93 (124.7 bb)
UTG: $55.79 (279 bb)
MP: $10.19 (51 bb)
CO: $20 (100 bb)
Hero (BTN): $20.30 (101.5 bb)

Preflop: Hero is BTN with 9 9
2 folds, CO raises to $0.60, Hero calls $0.60, 2 folds

Flop: ($1.50) 2 7 3 (2 players)
CO bets $0.90, Hero calls $0.90

Turn: ($3.30) 4 (2 players)
CO bets $1.60, Hero calls $1.60

River: ($6.50) 2 (2 players)
CO bets $3, Hero folds

Preflop: Standard call.

Flop: I hit an overpair, so decided to call.

Turn: Decided to call na overpair again, I think it's fairly standard.

River: Now it's tricky. I don't see him bluffing there, especially with that size. He has some 7x in his range, but I'm not sure that he will barrel 3 times with just TP there.

CO: 28/23/10/48 (VPIP/PFR/AF/H)