($30) How was this AK played?

$10 MTT on Party. BB has played more than the usual share of hands early and has shown some weak holdings.

I'm particualarly wondering about my river bet...his range could be two cards, but I'm thinking a pocket pair under Ten.

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (10 handed) converter

UTG+1 (t670)
UTG+2 (t1675)
MP1 (t930)
MP2 (t1510)
MP3 (t255)
CO (t1495)
Button (t870)
SB (t970)
BB (t1685)
Hero (t925)

Preflop: Hero is UTG with K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to t50</font>, <font color="#666666">6 folds</font>, Button calls t50, <font color="#666666">1 fold</font>, BB calls t35.

Flop: (t157.50) J[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets t75</font>, Button folds, BB calls t75.

Turn: (t307.50) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero checks.

River: (t307.50) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t100</font>, BB calls t100.

Final Pot: t507.50