Hello,
What to do on the river in this spot. I would agree that this might be bluffed spot at some frequencies. I have a Qd but didn't really take that into consideration when making decision.
Opponent was marked by me as a good reg and he had a high 3bet.

I think that I played flop and turn well.

PokerStars - $0.10 NL (6 max) - Holdem - 6 players

BTN: 75.6 BB
Hero (SB): 100.5 BB
BB: 101.5 BB
UTG: 100.2 BB
MP: 100 BB
CO: 108.8 BB

Hero posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has Qd Qs
fold, MP raises to 3 BB, fold, BTN calls 3 BB, Hero raises to 13 BB, fold, MP calls 10 BB, fold

Flop : (30 BB, 2 players) 4d 5h 8d
Hero bets 11.4 BB, MP calls 11.4 BB

Turn : (52.8 BB, 2 players) 7c
Hero checks, MP bets 21 BB, Hero calls 21 BB

River : (94.8 BB, 2 players) 9h
Hero checks, MP bets 54.6 BB and is all-in, hero ??