Villain basically just sat down with this size stack and is an unknown. I always bet the river. Is that best?

$0.5/$1 No Limit Holdem
6 players
Converted at weaktight.com

Stacks:
UTG Joy_ofPlayin ($498.00)
UTG 1 whollyflush ($134.20)
CO Hero ($133.45)
BTN voodooMi$$y ($87.00)
SB Rema2008 ($72.95)
BB damien94250 ($137.80)

Pre-flop: ($1.50, 6 players) Hero is CO
2 folds, Hero raises to $4, voodooMi$$y calls $4, 2 folds

Flop: ($9.50, 2 players)
Hero bets $7, voodooMi$$y calls $7

Turn: ($23.50, 2 players)
Hero bets $18, voodooMi$$y calls $18

River: ($59.50, 2 players)
Hero...