Villain is ottergolf11, a tricky aggressive player, definitely capable of making moves and bluffing. Whats your play on the turn and river and why?

Party Poker No-Limit Hold'em, $ BB (10 handed) FTR converter on zerodivide.cx

UTG+2 ($712.60)
MP1 ($597.90)
MP2 ($670.02)
Hero ($376.20)
CO ($512.80)
Button ($400)
SB ($415.15)
BB ($315)
UTG ($329)
UTG+1 ($755)

Preflop: Hero is MP3 with J, J. SB posts a blind of $2.
UTG calls $4, UTG+1 calls $4, 3 folds, Hero raises to $20, 4 folds, UTG calls $16, UTG+1 folds.

Flop: ($50) 8, 7, 6 (2 players)
UTG checks, Hero checks.

Turn: ($50) 7 (2 players)
UTG checks, Hero bets $35, UTG raises to $85, Hero calls $50.

River: ($220) 6 (2 players)
UTG bets $200, Hero ???