villian makes big flop bets like that a bunch. i put him on over pair maybe AA KK QQ JJ

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

Hero ($99.15)
BB ($49.25)
UTG ($50.50)
UTG+1 ($49.30)
MP1 ($62.35)
MP2 ($61.90)
MP3 ($50.65)
CO ($77.55)
Button ($43.75)

Preflop: Hero is SB with 6, A.
1 fold, UTG+1 raises to $1, MP1 calls $1, 4 folds, Hero calls $0.75, BB calls $0.50.

Flop: ($4) 9, 6, 6 (4 players)
Hero bets $3, BB folds, UTG+1 raises to $24.5, MP1 folds, Hero calls $21.50.

Turn: ($53) A (2 players)
Hero checks, UTG+1 checks.

River: ($53) 5 (2 players)
Hero ?