NL50: ok to fire on this river?

[alex-star]

The villain just sat down at the table, never seen them before.

No Limit Holdem Ring game
Blinds: $0.25/$0.50
9 players
Converter

Stack sizes:
UTG: $18.75
UTG+1: $25.10
MP1: $20.90
Hero: $67.95
MP3: $19.75
CO: $17.95
Button: $18.50
SB: $66.70
BB: $63.05

Pre-flop: (9 players) Hero is MP2 with A[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/diamond.gif[/img]
3 folds, Hero calls, 3 folds, SB calls, BB checks.

Flop: 8[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/spade.gif[/img] ($1.5, 3 players)
<font color="#cc0000">SB bets $1.5</font>, BB folds, <font color="#cc0000">Hero raises to $4.5</font>, SB calls.

Turn: Q[img]/images/graemlins/spade.gif[/img] ($10.5, 2 players)
SB checks, Hero checks.

River: 8[img]/images/graemlins/spade.gif[/img] ($10.5, 2 players)
SB checks, <font color="#cc0000">Hero bets $6</font>.