NL50 SH QQ in 3bet op on the sick river

[castor11]

$0.25/$0.50 No Limit Holdem
5 Players
Hand Conversion Powered by weaktight.com (http://weaktight.com/)

Stacks:
UTG ($16.75)
CO ($95.80)
BTN ($27.69)
SB ($58.41)
hero (BB) ($73.34)

Pre-Flop: ($0.75, 5 players) hero is BB :qs: :qc:
3 folds, SB raises to $1.50, hero raises to $4.50, SB calls $3

Flop: :4h: :tc: :js: ($9, 2 players)
SB checks, hero bets $6, SB calls $6

Turn: :7h: ($21, 2 players)
SB checks, hero bets $13, SB calls $13

River: :ks: ($47, 2 players)
SB checks, hero ($49.84)?

[babyonboard]

without any specific history i would just simply check behind. he folds everything worst hand if u bet as K is a scarycard, but he may also improve to 2 pair or made his gutter but its not so likely. if he is a big fish or thinks im bluffing(because of history), bet half the pot.

[NitroHUN]

Checkback, the stacks aren't optimal bet/folding this, and an allin just won't get any calls form worse.

[castor11]

I checkback, he had A7o.

[The teoszan]

I think that if he would have two pairs here he would raise on the flop or on the turn and would not check the river if he`d have a K so I would bet like half of the pot...but I`m fine with checking back too.