Is there value in this River Bet

[nomadtla]

Villan has been very quiet so far been around maybe 2 orbits and all signs point to weak tight. The whole tables been tight passive (pre) and fairlly calling station (post) but I didn't see this guy go to showdown yet. What's you line against a quiet player on the river, and what hands do you put him on? Think the rest of the hand is pretty standard though coment if something sticks out to you.

Absolute Poker .50/1 (9 players)

Preflop: Hero is UTG with K[img]/images/graemlins/spade.gif[/img]K[img]/images/graemlins/heart.gif[/img]
Hero Raises, 1 Fold, MP1 calls, 6 Folds

Flop: (5.5 sb)3[img]/images/graemlins/spade.gif[/img]J[img]/images/graemlins/club.gif[/img]A[img]/images/graemlins/heart.gif[/img] (2 players)
Hero bets, MP1 calls

Turn: (3.75 BB) A[img]/images/graemlins/club.gif[/img] (2 players)
Hero bets, MP1 calls

River: (5.75 BB) 8[img]/images/graemlins/diamond.gif[/img] (2 players)
Hero bets, MP1 calls

Final Pot (7.75 BB)

Looking at it now I don't think villan calls the turn or river with a worse hand, but at the time I was thinking a pocket pair would play scared like this, even on this board cause I was running hot and LAGing the weak/tight table. Should I have checked Turn or River?