200NL AK 3b pot oop, river decision?

[SharkSandwich]

I think it's a call. Definitely for this much.

KJ bets the Turn. AT and JT would be pretty much folding the flop.

So the only hand he's he's likely to have that beats you now is QJ.

So there's a good chance you're ahead, you've shown a lot of weakness on Turn/River making him think he can take the pot (which is the value in not betting the River). And you're completely priced into it, as strong as your hand is. I'd even call a bit of a larger bet.

Call, if he's got QJ so be it.