KTo from BB, riverplay?

Party Poker 5.00/10.00 Hold'em <font color="#0000FF">(10 handed)</font> link

No reads on villain.

Preflop: Hero is BB with T[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 folds</font>, UTG+1 calls, UTG+2 calls, <font color="#666666">2 folds</font>, <font color="#CC3333">MP3 raises</font>, <font color="#666666">3 folds</font>, Hero calls, UTG+1 calls, UTG+2 calls.

Flop: (8.40 SB) 2[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, UTG+1 checks, UTG+2 checks, <font color="#CC3333">MP3 bets</font>, <font color="#CC3333">Hero raises</font>, UTG+1 folds, UTG+2 folds, <font color="#CC3333">MP3 3-bets</font>, Hero calls.

Turn: (7.20 BB) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, MP3 checks.

River: (7.20 BB) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP3 raises</font>, Hero?

3bet or call? His weird turn check messed up my plans...