PokerStars, $1.96 + $0.24 - Hold'em No Limit - 25/50 (8 ante) - 8 players
Replay this hand on Upswing Poker

UTG: 6,399 (128 bb)
UTG+1 (Hero): 4,765 (95 bb)
MP: 4,739 (95 bb)
MP+1: 7,824 (156 bb)
CO: 4,810 (96 bb)
BU: 9,687 (194 bb)
SB: 4,861 (97 bb)
BB: 2,120 (42 bb)

Pre-Flop: (139) Hero is UTG+1 with Q♦ Q♣
1 fold, Hero raises to 125, MP 3-bets to 600, 5 players fold, Hero calls 475

Flop: (1,339) 6♥ 3♦ K♠ (2 players)
Hero checks, MP bets 670, Hero calls 670

Turn: (2,679) K♥ (2 players)
Hero checks, MP checks

River: (2,679) 7♦ (2 players)
Hero checks, MP bets 1,340, UTG+1 (Hero) folds

Bit of a gross spot but I think we can find a fold based solely on the fact he shouldn't have many bluffs here at all.

I think I'm calling this and expecting villain to roll over JJ/AJhh a lot and sometimes AhKx. I guess he can play aces like this too. I'm not sure but I'd call since we don't block hearts.

I think the villain c-bets this flop with nearly all of his pre-flop range, so that doesn't help us much, so let's look at the turn. Why would he check? 2 hearts came on board, wouldn't you want to protect a K with a bet to push away any backdoor hearts? Maybe he checks a middling pair because he is afraid you may have a better one? Then your check on the river might lead him to believe you are weaker than you are, and a bet from him could take the hand down. Initially when I read, I thought I would fold, but I would lean more towards calling, especially given how deep you are, but I would expect him to flip AK sometimes. Often times at these stakes I find people are not bluffing enough, definitely a tough spot imo.