Villain is a fish and 3bets often but not agro like.
I float on the flop with Backdoor flush, backdoor straight and overcards.
I don´t want to raise turn even when my hand had a lot of equity because I could be behind already.
Then he shoves river and I started thinking.
I block QQ, KQ, AKh and nut flush draw.
So is the most likely scenario is he had AA or KK there?
Are there any bluffs in his range after I called turn?
Then he shows me that card on the river.
What do you think about the hand?
it's KK, AK with a heart is impossible because you have the A:h yourself.
if he was bluffing, then he would show both cards 
I think calling the turn is fine.
KQ is solidly in his range, but as you say, you're blocking it.
Folding the river is OK, but only because he is betting every street.
I'm wondering what others think about 4Betting pre, since as you say, he 3Bets a lot.
I agree Tomaloc, if he was bluffing he would show me both.
Vorpal, about 4betting this... I usually do this in other positions, but I´ve crashed many times when I raised from MP or UTG and I face 3bets from SB or BB. Many times they 5 bet me there.
I would only 4Bet AQ vs SB if SB 3Bet "a lot" but I don't define "a lot"
I was just curious about how others handle this.
4bet would be a decent option if villain folds a lot on 4bets. Otherwise I would just call as well and play the pot in position. Maybe you have also info ghat villain 3bets a lot in a UTG against SB scenario.
Cheers,
SDK1987
good lay day, don't think he has a Flush but KK is very possible and I agree if it was a true bluff he is showing them both.. .. 4betting Sb is a little rough, need to have an idea on what the their strategy is, 3bet or fold/ play how I feel etc... I find it pretty hard to 4 bet Sb personally, I get myself into issue with it. But AQoff is a good candidate for it.
keep grinding.. 
