50 NL: weak fold on river?

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Villain seemed semi-reasonable, but I hadn't played a lot of hands with him. He had open-limped a couple of times before this hand. A few hands previously, I had bet a raggish board on the turn in a multiway pot and then bet the river when the 4-straight came. He thought a bit and folded. Other than that we hadn't really tangled.

** Elblag [Hold 'em] (0.25|0.50 No Limit - Cash Game) Real Money

- Villain sitting in seat 1 with $84.73
- SingForMe sitting in seat 2 with $73.95 [Dealer]
- Kisaragi sitting in seat 3 with $38.18
- Hero sitting in seat 4 with $64.32
- seXXXybabe sitting in seat 5 with $49.00

Kisaragi posted the small blind - $0.25
Hero posted the big blind - $0.50
** Dealing card to Hero: 9 [img]/images/graemlins/heart.gif[/img], 9 [img]/images/graemlins/spade.gif[/img]
seXXXybabe folded
Villain called - $0.50
SingForMe folded
Kisaragi called - $0.50
Hero bet - $3.00
Villain called - $3.00
Kisaragi folded

** Dealing the flop: 7 [img]/images/graemlins/diamond.gif[/img], 5 [img]/images/graemlins/heart.gif[/img], 5 [img]/images/graemlins/spade.gif[/img]
Hero bet - $4.00
Villain called - $4.00

** Dealing the turn: Jack [img]/images/graemlins/diamond.gif[/img]
Hero bet - $10.00
Villain called - $10.00

** Dealing the river: 10 [img]/images/graemlins/spade.gif[/img]
Hero checked
Villain bet - $17.25 (half-pot)
Hero ?