Did he flop the nuts or turn the nuts or what? Try to get past the lack of a pfr...

50NL

Hero is UTG ($50) with
Villain is CO ($50)

Pre-Flop
Hero calls .50
Villain raises to $3.25
BU calls $3.25
Hero calls $2.75

Flop (3 Players, Pot = $10)


Hero checks
Villain checks
BU checks

Turn (3 Players, Pot = $10)


Hero bets $7
Villain raises to $17
BU folds
Hero calls $10

River (2 Players, Pot = $44)


Hero checks
Villain is All-In (~$30)
Hero ?