Villain's an unknown.

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
5 players
Converter

Stack sizes:
UTG: $108.25
CO: $35.90
Hero: $123.55
SB: $133.75
BB: $113.25

Pre-flop: (5 players) Hero is Button with 8 A
2 folds, Hero raises to $2, SB calls, BB calls.

Flop: 8 9 Q ($6, 3 players)
SB checks, BB checks, Hero bets $4, SB folds, BB raises to $8, Hero calls.

Turn: 8 ($22, 2 players)
BB checks, Hero ???