Villain is 46/23 over 25

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

MP ($43.50)
CO ($111.10)
Button ($98.50)
SB ($204.20)
Hero (BB) ($134.40)
UTG ($178.35)

Preflop: Hero is BB with 9 4
UTG calls $1.00, 3 folds, SB calls $0.50, Hero checks

Flop: ($3.00) 5 9 4 (3 players)
SB bets $2.00, Hero raises to $6.00, 1 fold, SB calls $4.00

Turn: ($15.00) Q (2 players)
SB checks, Hero bets $12.00, SB calls $12.00

River: ($39.00) A (2 players)
SB checks, Hero ...?