nl25 do i call river bet?

[tmcdmck]

Im afraid I dont have the HH, so this is from memory. I had just sat down at table, villain is unknown. Effective stacks are 25.

I was dealt KJ late position, open raised to $1.25 after 1 limper. BB and limper called.

Flop came JJ9, It was check to me and I checked.

Turn came an A, bord is now rainbow. the limper raises $6.25, (almost twice the pot?!). I call, BB folds.

River comes a brick, maybe a 5. Limper shoves his remaining stack. What do I do?

I feel I misplayed the turn by not raising, preflop was marginal (though I did have position, so i do not feel it was too bad), and the flop might have been better bet, but that is quite marginal aswell I feel. My main question is do i call all in as played? (though any thoughts that I have not already given are welcome!)