make a bluff on the river?

[b33nz]

villain seems to be a decent lag player. it seems he most likely has a mid pair (JJ-). is this believable?

Full Tilt Poker
$3/$6 No Limit Hold'em Ring Game
6 Players
LegoPoker Hand Converter

<font color="black">Stack Sizes</font>
SB: $613.85
Hero (BB): $1265.2
UTG: $760.20
MP: $129
CO: $729.60
BTN: $582

<font color="black">Preflop:</font> A T ($9, 6 players)
UTG folds, MP folds, CO folds, <font color="red">BTN raises to $21</font>, SB folds, <font color="red">Hero raises to $74</font>, BTN calls $53

<font color="black">Flop:</font> 5 4[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/heart.gif[/img] ($151, 2 players)
<font color="red">Hero bets $110</font>, BTN calls $110

<font color="black">Turn:</font> 5 4[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/heart.gif[/img] [9[img]/images/graemlins/heart.gif[/img]] ($371, 2 players)
Hero checks, BTN checks

<font color="black">River:</font> 5 4[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/heart.gif[/img] [7] ($371, 2 players)
<font color="red">Hero bets $300</font>