NL50 SH TPTK on river

[castor11]

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

Stacks:
hero (UTG) ($50.75)
CO ($87.59)
BTN ($77.05)
SB ($58.99)
BB ($30.80)

Pre-Flop: ($0.75, 5 players) hero is UTG :qd: :ad:
hero raises to $1.50, 1 fold, BTN calls $1.50, 1 fold, BB calls $1

Flop: :5s: :4h: :9c: ($4.75, 3 players)
BB checks, hero checks, BTN checks

Turn: :as: ($4.75, 3 players)
BB bets $3, hero raises to $9, BTN calls $9, BB folds

River: :6c: ($25.75, 2 players)
hero ($40.25)?

bb is a fish, but the btn unknown

What do I do on the river?

[Lev729]

I like c/c here, because BTN can call with some backdoor draw OTT and most of draws is busted OTR.

[want2push]

I check and hope button checks, too. :)

[castor11]

He had 44.