Set on 4-flush board against shortstacked donk

[PoBoy321]

Villain's been playing on a couple of my tables. He's loose pre-flop, passive postflop and basically a donk. He only has 1/5 of the pot left in his stack on the end, so do I put him in, check/call or check/fold?

Ultimate Bet No-Limit Hold'em, $.10 BB (6 handed) converter

UTG ($4.05)
Hero ($9.75)
CO ($7.50)
Button ($6.55)
SB ($8.50)
BB ($2.95)

Preflop: Hero is MP with 9[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
UTG calls $0.10, <font color="#CC3333">Hero raises to $0.6</font>, CO calls $0.60, <font color="#666666">2 folds</font>, BB calls $0.50, UTG folds.

Flop: ($1.95) K[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets $1.45</font>, CO calls $1.45, BB folds.

Turn: ($4.85) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $3</font>, CO calls $3.

River: ($10.85) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero...

EDIT to remove river action.