Flop 2-pair, pfr checks behind and then wakes up on turn

[Wolfram]

Villain is lagtag. I haven't seen him pull any big moves yet. Fold or call?

Poker Stars, $0.50/$1 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

UTG: $178.20
CO: $104.50
BTN: $49.45
Hero (SB): $145.05
BB: $100.15

Pre-Flop: 2[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img] dealt to Hero (SB)
UTG folds, <font color="red">CO raises to $3</font>, BTN calls $3, Hero calls $2.50, BB folds

Flop: ($10) A[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/club.gif[/img] (3 Players)
Hero checks, CO checks, BTN checks

Turn: ($10) 6[img]/images/graemlins/heart.gif[/img] (3 Players)
<font color="red">Hero bets $7</font>, <font color="red">CO raises to $20</font>, BTN folds, Hero calls $13

River: ($50) J[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $81.50 and is All-In</font>, Hero ???