KK very deep. Pay off river? 1/2

[McRoNiX]

Villain is 38/18/1.2 over 250ish. Think I played this well up to river.. Do I have to call this, even with his low AF? Kinda put him on spades or TT/JJ.
See the latter enough here to call?

Absolute Poker
No Limit Holdem Ring game
Blinds: $1/$2
6 players
Converter

Stack sizes:
UTG: $887
UTG+1: $200.80
CO: $397
Hero: $554.05
SB: $153.50
BB: $249.90

Pre-flop: (6 players) Hero is Button with K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img]
<font color="#cc0000">UTG raises to $8</font>, 2 folds, <font color="#cc0000">Hero raises to $27</font>, 2 folds, UTG calls.

Flop: 5[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img] ($57, 2 players)
UTG checks, <font color="#cc0000">Hero bets $44</font>, UTG calls.

Turn: 3[img]/images/graemlins/spade.gif[/img] ($145, 2 players)
UTG checks, Hero checks.

River: 7[img]/images/graemlins/club.gif[/img] ($145, 2 players)
<font color="#cc0000">UTG bets $86</font>, Hero Calls??