Is This A Fold? Stars $500K

[ChewyMint]

My first inclination was to fold the river, but I figured KK/JJ or a missed flush all play the river the same.
PokerStars No-Limit Hold'em Tourney, Big Blind is t30 (9 handed) converter

BB (t950)
UTG (t4773)
UTG+1 (t2980)
Hero (t2817)
MP2 (t4290)
MP3 (t2600)
CO (t2280)
Button (t2370)
SB (t2300)

Preflop: Hero is MP1 with A[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t180</font>, <font color="#666666">4 folds</font>, SB calls t165, <font color="#666666">1 fold</font>.

Flop: (t390) Q[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets t400</font>, SB calls t400.

Turn: (t1190) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

River: (t1190) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t540</font>, Hero calls t540.

Final Pot: t2270

Results in white below: <font color="#FFFFFF">
SB has Ad Qh (three of a kind, queens).
Hero has Ac Ah (two pair, aces and queens).
Outcome: SB wins t2270. </font>