Do I Have To Call This River Bet?

[Unarmed]

No reads. The overbet could very easily be a monster, or any J, or a complete bluff.

$5 PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (9 handed)

MP1 (t1440)
MP2 (t1580)
MP3 (t1460)
CO (t1550)
Button (t1470)
Hero (t1460)
BB (t1580)
UTG (t1500)
UTG+1 (t1460)

Preflop: Hero is SB with Q[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/spade.gif[/img].
UTG folds, UTG+1 calls t20, MP1 folds, MP2 folds, MP3 folds, CO calls t20, Button folds, Hero completes, BB checks.

Flop: (t80) 7[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/diamond.gif[/img] <font color="blue">(4 players)</font>
Hero checks, BB checks, UTG+1 checks, CO checks.

Turn: (t80) 2[img]/images/graemlins/heart.gif[/img] <font color="blue">(4 players)</font>
Hero checks, BB checks, UTG+1 checks, CO checks.

River: (t80) J[img]/images/graemlins/diamond.gif[/img] <font color="blue">(4 players)</font>
Hero checks, BB checks, <font color="CC3333">UTG+1 bets t100</font>, CO folds, Hero ???