NL 50 - rivered gutshot second-nut flush

[YKMM]

Poker Stars
No Limit Holdem Ring game
Blinds: $0.25/$0.50
4 players
Converter (http://www.neildewhurst.com/hand-converter)

Stack sizes:
Hero: $60.25
Button: $77.45
SB: $48.50
BB: $21.25

Pre-flop: (4 players) Hero is UTG with K/images/graemlins/spade.gif Q/images/graemlins/diamond.gif
<font color="#cc0000">Hero raises to $2</font>, Button folds, SB calls, BB calls.

Flop: 3/images/graemlins/heart.gif Q/images/graemlins/spade.gif J/images/graemlins/spade.gif ($6, 3 players)
SB checks, BB checks, <font color="#cc0000">Hero bets $5</font>, SB calls, BB folds.

Turn: 2/images/graemlins/spade.gif ($16, 2 players)
SB checks, <font color="#cc0000">Hero bets $9.5</font>, SB calls.

River: 3/images/graemlins/spade.gif ($35, 2 players)
<font color="#cc0000">SB is all-in $32</font>, Hero ......

SB is 42/10/2.0 in 100 hands. No other reads and river tendencies are unknown. Call or fold river?

[MrMxyztplk]

Check turn.

As played, tough call. Strange play to make with any hand. I'd be inclined to call.