KK river play

[AZplaya]

Villian is a call station, but I have also seen him bluff a busted draw. Normally I like a check/call here, but since the pot is bigger than my stack, thoughts on just shoving?

Party Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
6 players
Converter

Stack sizes:
UTG: $38.29
UTG+1: $23.76
Hero: $88.90
Button: $206.64
SB: $128.68
BB: $124.64

Pre-flop: (6 players) Hero is CO with K[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img]
2 folds, <font color="#cc0000">Hero raises to $4</font>, Button calls, 2 folds.

Flop: 9[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/heart.gif[/img] ($9.5, 2 players)
<font color="#cc0000">Hero bets $7.5</font>, Button calls.

Turn: 6[img]/images/graemlins/club.gif[/img] ($24.5, 2 players)
<font color="#cc0000">Hero bets $20</font>, Button calls.

River: 5[img]/images/graemlins/club.gif[/img] ($64.5, 2 players)
Hero ???

shove or check call???

oh, and yes, I need to rebuy pre flop.