I'm fairly new to the table so no read on my opponent. What do you do in response to the check raise on the river?

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed)

Button ($83.6)
SB ($140.95)
BB ($34.4)
UTG ($92.1)
MP ($35.2)
DaHitDogg ($103.22)

Preflop: DaHitDogg is CO with , . SB posts a blind of $0.5.
2 folds, DaHitDogg calls $1, 1 fold, SB (poster) completes, BB checks.

Flop: ($3) , , (3 players)
SB checks, BB checks, DaHitDogg bets $3, SB calls $3, BB folds.

Turn: ($9) (2 players)
SB checks, DaHitDogg bets $8, SB calls $8.

River: ($25) (2 players)
SB checks, DaHitDogg bets $20, SB raises to $90

I'm all-in. the SB might have K4 or K10...but it's more likely he hit that river flush..or just has a king with a decent kicker.

I didn't even notice that villian was out of position. That certainly changes things. I still think ht's very possible he has K2, but it makes the call a lot easier.

Thanks for the replies, I'll take some solace in the fact that I played it correctly. Unfortunately, I called and Villian had KT for the top boat. I can't imagine anyone playing this hand worse than he did. Slowplaying two pair is a no-no in my book and I never go for a check raise on the river w/ the nuts. Also, his oversized raise also made me think he had a lone king, b/c most people wouldn't raise that much w/ the nuts either.