he is new to the table, pt stats 35/13/1.5, no reads

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed) converter

Hero ($101.35)
Button ($105.40)
SB ($230.92)
BB ($25)
UTG ($102.45)
MP ($137.49)

Preflop: Hero is CO with 6, 6. SB posts a blind of $0.50.
UTG calls $1, 1 fold, Hero calls $1, Button raises to $4, 1 fold, BB calls $3, UTG calls $3, Hero calls $3.

Flop: ($16.50) 6 , K, Q (4 players)
BB checks, UTG checks, Hero checks, Button bets $6, BB folds, UTG folds, Hero raises to $20, Button calls $14.

Turn: ($56.50) 2 (2 players)
Hero bets $30, Button calls $30.

River: ($116.50) T (2 players)
Hero ?????