[Pokey]

As to this hand, I agree with KDawg: bet/fold the turn, check/fold UI on the river.

Note that AK with a flop of QJ4o is VERY different from your current situation. First, with AK you've got two overcards to the board, giving you six outs to TPTK. With AQ on this board, you've got three overcards to TP2K and three more outs to 2PTK. Those queens aren't as strong, especially with three opponents. Furthermore, you've got two diamonds on this board, meaning that outs will be harder to clean and you're going to have to fear any additional board diamonds.

Still, when the board pairs those kings, you've really got to bet them. Nobody raised your flop bet and you've shown lots of aggression; you could easily have trips, and your opponents are going to be soiling themselves over it. I expect that a turn bet folds out two or more of your opponents. Of course, any diamond draw is still going to call and bust you on the river here, but you spins the wheel and you takes your chances. Betting this turn improves your chances of winning enough that it's a +EV move.