Early Tournament 2 pair--too aggressive?

[Paul Thomson]

I was in the first round of a $10 sng and have AKo in 2nd position. UTG raises twice the blind, I make it 5x the blind to go (not wanting any calls and giving the original raiser a chance to fold). Everyone folds to the UTG and he calls.

The FLOP comes A K Q (rainbow)

It's checked to me. I bet 3/4 of the pot, and the Villian calls. I'm a little suspicious but with top two pair not to worried.

The TURN brings A K Q 4 with two spades.

Villian checks, and I bet 1/2 the pot, and Villian calls again.

The River brings A K Q 4 9 (no flush)

Villian checks...I feel like checking but with half the buy in still out there feel that I can get a call from a weaker Ace or two pair and put it all in, hoping that I found a fish.

Should I check the river, assuming I could be beat? My thinking goes, most of the time when I'm beat in this situation I am bet into.