200NL annoying river against loose moron

[l3auble]

Villain is 47/15/0/84 and generally loose and stupid. Any chance I can fold this river? I'm thinking no but just wanted to double check.

Poker Stars - No Limit Hold'em Cash Game - $1/$2 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $167.65
Villain (BB): $141.70
Hero (UTG): $342.75
MP: $214.25
CO: $117.80
BTN: $108.70

Preflop: Hero is dealt K[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img] (6 Players)
<font color="red">Hero raises to $8.00</font>, 4 folds, Villain calls $6.00

Flop: ($17) 4[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img] (2 Players)
Villain checks, <font color="red">Hero bets $12.00</font>, Villain calls $12.00

Turn: ($41) 2[img]/images/graemlins/spade.gif[/img] (2 Players)
Villain checks, <font color="red">Hero bets $32.00</font>, Villain calls $32.00

River: ($105) 6[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Villain bets all-in for $89.70</font>, Hero calls $89.70