Total air river bluff?

[try_2_improve]

UTG is really tight.I dont use a hud and dont believe in them so I dont have numbers.But hes super tight.Id say he has ak,aq, and jj up for the most part.hes playing pretty robotic so I doubt hes out of line with raising a looser hand for image/meta.I call preflop cuz my hand is so versatile for implied odds and stealing against this player postflop since my image and gameflow is good.Plus we have decent stacks....I call flop with implied odds with the gutshot str8 and flush draw. And because I felt I had fold equity with the board texture against him depending on how he continues to react on turn.When he checked on the turn I just thought there was a great* chance hed fold to a believable bet, and a good chance hed fold to a double barrel depending again on how he reacts.Plus im not totally drawing dead especially with the 7 if he calls. When he called turn I was pretty surprised, he just seems to tight to call with a 6 outer (aq-ak) in hopes of hitting on one street.Thoughts on river bluff? Also I tried to convert hand and it wouldnt post it? Said not allowed to use img code?

PokerStars Game #58953842456: Hold'em No Limit ($0.02/$0.05 USD) - 2011/03/10 1:20:19 ET
Table 'Dagmar XII' 6-max Seat #2 is the button
Seat 1: sunny_gofish ($1.30 in chips)
Seat 2: Hero ($3.75 in chips)
Seat 4: dHarper91 ($2.33 in chips)
Seat 5: Hairy_Llama ($6.08 in chips)
Seat 6: SERSHELL ($3.98 in chips)
dHarper91: posts small blind $0.02
Hairy_Llama: posts big blind $0.05
*** HOLE CARDS ***
Dealt to Hero [Td 8d]
SERSHELL: raises $0.10 to $0.15
sunny_gofish: folds
Hero: calls $0.15
dHarper91: folds
Hairy_Llama: folds
*** FLOP *** [6d 5c 9h]
SERSHELL: bets $0.25
Hero: calls $0.25
*** TURN *** [6d 5c 9h] [3h]
SERSHELL: checks
Hero: bets $0.40
SERSHELL: calls $0.40
*** RIVER *** [6d 5c 9h 3h] [4s]
SERSHELL: checks
Hero: ???