Push this river or call with set of jacks?

[ImpulseKid]

Villain is 41/10/2.1 from 188 hands. Only other big hand he had on table is when he flopped a straight v top2 and he got it in on the flop. I have raised a lot in position when he has limped and over the last 30mins hes been limp calling my raises rather than folding like at the beginning of the session.

GAME #730555303: Texas Hold'em NL $0.50/$1.00 2007-11-21 13:18:41
Table Dinisville
Seat 1: ($96.30 in chips)
Seat 2: ($87.80 in chips)
Seat 3: VILLAIN ($208.30 in chips)
Seat 4: ($125.90 in chips)
Seat 5: HERO ($198.50 in chips) DEALER
Seat 6: ($159.40 in chips)

Seat 6: Post SB $0.50
Seat 1: Post BB $1.00

*** HOLE CARDS ***
Dealt to lmpulseKid [J [img]/images/graemlins/club.gif[/img] J [img]/images/graemlins/spade.gif[/img]]

Seat 2: Fold
VILLAIN: Call $1.00
Seat 4: Fold
HERO: Raise $4.00
Seat 6: Fold
Seat 1: Fold
VILLAIN: Calls $3.00

*** FLOP *** [8 [img]/images/graemlins/club.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img] 6 [img]/images/graemlins/spade.gif[/img]]

VILLAIN: Check
HERO: Bet $9.00
VILLAIN: Call $9.00

*** TURN *** [J [img]/images/graemlins/diamond.gif[/img]]

VILLAIN: Check
HERO: Bet $27.00
VILLAIN: Call $27.00

*** RIVER *** [K [img]/images/graemlins/spade.gif[/img]]

VILLAIN: Bet $50.00
HERO: ???

Who calls and who pushes?

[DanJ.]

ez shove.

There are only a few str8's and KK that beats you, and KK is unlikely, same as T7.

[rochaldinho]

TQ... Call

[Nick Royale]

Push.

[Ranger_Trivette]

I shove, though sometimes they have it.

[Noam Chomsky]

why would you ever do anything but shove here?

[JFsports]

I think this is an easy shove. You have the best hand the vast majority of the time, and he will call with worse sets/2 pairs a lot of the time too.
Also you said in the OP that he got it in on the flop with a straight, which imo makes it less likely he slowplayed a straight on the flop or the turn.