villain is a old rich guy who sat down with 500, give LOT of action. won couple big pot, now he's sitting there with 3000. i estimate he plays 95% of hands and PFR 50%. ppl told me that he plays 5/10 and ezly dump 5k a nite at those table.

history between me and him.

i limped with 64 diamonds after 1 limper, villain raised OOP with 27 or so, both limper called.
flop k93 2 diamonds, he bet 2/3 of pot on flop, brick on turn, 2/3 pot on turn, and a 6 fall on river, he still bet 2/3 of the pot which was like 275. i hero called him with a small pair (lol) found out he has KQ in that spot. (just a history hand, but any comments are welcomed.) so, bottom line is, he knows i can call (lol again.)

current hand. my stack 900. villain covers.

he raised to 25 utg+2, +3 calls, i call with aj off, sb calls, 4 way action to flop (105)
flop AK2 2 hearts, villain bet 65, i call, others fold. (235)
turned ace. villain bets 185. i call, leaving me around 600. (605)
river a brick, he 3rd barreled for 400, now what?

is this a ez call since i called his turn bet? or should i revalue on river? a good 5/10 winning player told me it's ez call since i called on turn, but my call does slow villain down sometimes on river, no? i did felt vomit at the time. lol

shove for value

As Played, with the information you've given. Snap Call and watch him snap muck

OP, forgive me if I'm wrong but I really question your take on this villain. Plays 95% of hands? For all practical purposes you're saying he plays every hand. Sometimes it seems like people play every hand, but of course that's not true at all. And if he raises 50% 1st in vs raising 50% of pots he plays, he can be a real good player instead of a maniac. If he's a regular and sitting with 3k here I'm wondering if he's actually a good player.

Consider 3 betting here preflop, there's 100 in the pot and it's a good spot for a squeeze with AJ, especially if he raises 50% of his hands(he opened) here

yes... two good regs came up to tell me that he's a big whale at 5/10, the way he got to that big stack, cause he called with j9 off in a 3bet pot 5 way, 400 in pot, flop kq10, got it in 3 way... heh, that was a 2300 pot alone.

This is what basically came to my mind as well, if you're not going to fold. the other players are observing what you are and want a piece of the action. I don't want to be CCing AJ with alot of players in between. You're going to have to play a big pot and it may cost you your entire stack. You 3-bet big here and if the maniac comes back over the top and it's folded around to you, then you go off your reads and make a decision.
As played, I can only assume that you called TPGK here because it was multi-way. Once you get to the turn HU with the maniac, why not shove the turn? Calling the turn may not get you all in on the river if he makes a $300-$400 bet and you decide to call. It sounds like you want to get it all-in v.s this player, the turn seems like a good place, although I could see just letting him barrell off.

you told us alot about the villain preflop, what about his postflop betting tendencies other than the kq hand. i think he could be value cutting himself alot of times here because of your hero call earlier, which i think was bad because it seems hes pretty loose preflop but postflop doesnt seem THAT bad. anyways yea you have better than a bluffcatcher here because your kicker is pretty good, id call here as played, but you need to tell us more about postflop play with villain

Does anyone consider folding AJo in this spot, even in position. Just seems like alot of bad things coudl happen.

I agree. It's best to 3bet or fold. Calling sets us up for a 3bet behind us, which we have to fold. Also like you said AJ doesn't play great multiway and sets us up for a big loss to AQ/AK.

Vs your described opponent type, I think squeezing pf is the best play. You should 3bet your AJ to isolate the maniac who opened. AJo does not play well multi-way, but it does play well HU w/ position against a maniac.

You should call the river as played. Also, you need to describe what card the river is just saying brick when up against an opponent of this description is insufficient, there really isn't many "bricks" in a hand as you describe.