NL50: TPTK facing ckrs on river

[oakrdrzfan]

Villain is 37/5/3 over only 20 hands. Is calling this min ck rs on the river a spew. I am getting 5 to 1 on the call. I don't see laying it down. I don't think a JT made straight would ck the river after i chk'd the turn. Maybe 2 pair? This seemed like an unorthodox move.

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 8 Players
LeggoPoker.com - Hand History Converter

UTG: $8.75
UTG+1: $32
MP1: $23
MP2: $40.05
Hero (CO): $49.25
BTN: $127.80
SB: $43
BB: $51.40

Pre-Flop: A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/heart.gif[/img] dealt to Hero (CO)
3 folds, MP2 calls $0.50, <font color="red">Hero raises to $2.25</font>, BTN folds, SB calls $2, BB folds, MP2 calls $1.75

Flop: ($7.25) Q[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] (3 Players)
SB checks, MP2 checks, <font color="red">Hero bets $5</font>, SB calls $5, MP2 folds

Turn: ($17.25) 4[img]/images/graemlins/diamond.gif[/img] (2 Players)
SB checks, Hero checks

River: ($17.25) 9[img]/images/graemlins/club.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $8</font>, <font color="red">SB raises to $16</font>, Hero calls, pushes, folds?