River against LAG

[Roy6]

BB is 76/14/1.4/42 after 300+ hands
He likes to donk second pairs, longshot draws, but rarely bets with complete air.
On the turn I obviously wanted a free showdown, what's your plan once he bets the river?
I put him on either a king, a slowplayed flush (sometimes LAGs slowplay good hands), or a bluff with 98, 9T, TJ, QT.

Party Poker 3.00/6.00 Hold'em <font color="#0000FF">(6 handed)</font> link

Preflop: Hero is Button with J[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/club.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 folds</font>, BB calls.

Flop: (4.33 SB) A[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, Hero calls.

Turn: (3.17 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, BB calls.

River: (5.17 BB) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, Hero

The king is a good card for your. Its less of a chance that he has a pair higher than yours.