Middle set, fairly tough opponent, unwelcome turn.

[imported_anacardo]

Party Poker No-Limit Hold'em, $ BB (9 handed) converter

CO ($20.85)
Hero ($46.65)
SB ($55.20)
BB ($141.52)
UTG ($48.50)
UTG+1 ($43.50)
MP1 ($53.60)
MP2 ($50.10)
MP3 ($50.35)

Preflop: Hero is Button with T[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/club.gif[/img]. SB posts a blind of $0.25.
<font color="#666666">1 fold</font>, UTG+1 calls $0.50, MP1 calls $0.50, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $3</font>, <font color="#666666">2 folds</font>, UTG+1 folds, MP1 calls $2.50.

Flop: ($7.25) T[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
MP1 checks, <font color="#CC3333">Hero bets $5</font>, MP1 calls $5.

Turn: ($17.25) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
MP1 checks...

MP1 is tight-passive aggressive after a small (56) number of hands. He's been showing down winners. The hand before was also a headup raised pot; he picked off my continuation bet.

I imagine he could have any number of things in this spot. What's Hero's action and plan for the rest of the hand?