Blinds 1k/2k -250ante

Hero SB 85k
BB 120k
UTG 56k
UTG1 101k
Villain 77k
Button 73k

Prizes
1st $225
2nd $135
3rd $103
4th $77
5th $60
6th $45

Folds to Villain opens opens to 12k, he had been doing these huge raises often, typically indicates a fish IMO. No specific reads but was splashing around a lot and clearly not a good reg.

Hero with KhKc?

I made it 26k and he flat calls. Pot ~56k

Flop Ac8cQh

I checked he checked.

Turn 7h

I checked he checked.

River 7c

I check he bets 37k and I fold.

Feedback on all streets appreciated. Feel like my hand was face up by the river, but this guys not very good so he probably isn't reading hands very well. Not convinced he turns 1010 or JJ into a bluff (will probably 4bet shove pre also). I think he has something like AJ or A10. Should I have just stabbed small on flop or turn and then gave up if called?

Thanks