steal on river vs. unknown?

[pgil]

He is new to the table. I haven't seen him before. This doesn't mean that much as I only play about 7-9k hands a month.

Pf was just a raise to isolate, guy had been limping then folding a lot of hands on the flop.

I feel like opp has overs a lot here, but I am not that sure about it. Still worth a bet?

PokerStars Game #13942127570: Hold'em No Limit ($0.50/$1.00) - 2007/12/18 - 12:41:19 (ET)
Table 'Guangxi' 9-max Seat #5 is the button
Seat 1: greenngld ($99 in chips)
Seat 2: 1_Andrew_1 ($28 in chips)
Seat 3: pgil ($176.10 in chips)
Seat 4: Mardagg ($100 in chips)
Seat 5: Euri37 ($51.65 in chips)
Seat 6: Sandviper23 ($99 in chips)
Seat 7: jrshotta ($22.70 in chips)
Seat 8: ChristianS86 ($78.70 in chips)
Seat 9: 66billyboy ($59.55 in chips)
Sandviper23: posts small blind $0.50
jrshotta: posts big blind $1
*** HOLE CARDS ***
Dealt to pgil [Js Kc]
ChristianS86: calls $1
66billyboy: folds
greenngld: folds
1_Andrew_1: folds
pgil: raises $3 to $4
Mardagg: folds
Euri37: calls $4
Sandviper23: folds
jrshotta: folds
ChristianS86: folds
*** FLOP *** [3c 5h 5d]
pgil: bets $6
Euri37: calls $6
*** TURN *** [3c 5h 5d] [2d]
pgil: checks
Euri37: checks
*** RIVER *** [3c 5h 5d 2d] [Tc]
pgil:

[spoonitnow]

As played I check/fold river because you're getting called by A-high a lot of the time I think.

[TomJenks23]

I agree with spoon here. A-high calldown