AJs turn

The flop is good for a c-bet. Nothing wrong here.
Turn card is a heart, which gives you the nut-flushdraw. You could've checked for pot control, but a bet here might be a good option as well to steal the pot. Once he called here, it's clear he has something like KT, QT, JT, a hidden set or a draw. Two-pair is not very likely.
The K♦: on the river seems a good bluffing card. Flushdraws miss and straight-draws are not your concern here. Once you were playing out of position and kept betting, you're either bluffing your you have a monster. AA, QQ, JJ, TT are consistent with your playing. KK are less likely because of the blocker.
You offered him 32% pot odds and he has more equity than that in this spot.
I believe a bigger size bet in this situation will do better than a small size bet most of the times. Check the river is also a good play, to balance your range, to keep the pot small and give yourself a chance to see if your ace-high is good.

I would just give up here on the river because you can still be ahead of some of his hands. He may have J9 or JQ given that he is most probably a fish looking at his stack size.

Originally posted by Bebabcsinya
I would just give up here on the river because you can still be ahead of some of his hands. He may have J9 or JQ given that he is most probably a fish looking at his stack size.

Totally agree.

I'd just give up. By the size of the stack of the villain we can deduce that it is a fish and this type of player does not like to fold.

Check or bet are both fine

But when you do bet you got to make it really big, this is burning money

Why the K is so good bluffing card exactly? What Kx hands do we barrel OTF and OTT? I'm not sure if we can rep that king so well. NL10 regs in 2018 should also realize that it probably didn't hit us that hard. Then making the bet sizing OTR smaller than you did on previous streets doesn't really show that much strength?

I agree with just checking or then bombing it and making him fold.

How about the overbet the turn. Seems fine turn for that. It will cover our hand and we put more pressure on him because he have to worry now about the river bet sizing?