$50 NLCASH - TP vs aggro river bet

[DeathbySuckout]

Villain is a regular at the new $50NL HU games, and from what I've seen, looks like he's doing good. Tonight was the first time I've played him though.
He calls 3 bets pretty light (caught him w/K3o) and I caught him 3 barreling once. I feel like he probably could bluff here. Does that read justify a river call?
Villain is 46/41/4.2

Poker Stars - No Limit Hold'em Cash Game - $0.25/$0.50 Blinds - 2 Players - (LegoPoker Hand History Converter)

Hero (BB): $97.10
SB: $53.65

Preflop: Hero is dealt Q[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">SB raises to $1.50</font>, <font color="red">Hero raises to $4.50</font>, SB calls $3.00

Flop: ($9) K[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $7.50</font>, SB calls $7.50

Turn: ($24) 2[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, SB checks

River: ($24) 5[img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, <font color="red">SB bets $16.00</font>, Hero?