NL25: tough river decision with middle 2 pair

[roll]

villain is 25/4.9/.60 over 305 hands.

Poker Stars
No Limit Holdem Ring game
Blinds: $0.10/$0.25
9 players
Converter

Stack sizes:
UTG: $24.30
UTG+1: $17.45
MP1: $4.75
MP2: $26.45
MP3: $20.50
CO: $6.70
Button: $23.75
SB: $20.75
Hero: $26.50

Pre-flop: (9 players) Hero is BB with 5[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/spade.gif[/img]
6 folds, Button calls, SB folds, Hero checks.

Flop: 2[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/heart.gif[/img] ($0.6, 2 players)
<font color="#cc0000">Hero bets $0.5</font>, Button calls.

Turn: K[img]/images/graemlins/spade.gif[/img] ($1.6, 2 players)
<font color="#cc0000">Hero bets $1.5</font>, <font color="#cc0000">Button raises to $3</font>, Hero calls.

River: A[img]/images/graemlins/heart.gif[/img] ($7.6, 2 players)
Hero checks, <font color="#cc0000">Button bets $5</font>, Hero ?

When villain raised the turn I was afraid of KT or better but I also thought flush draws were in his range.

I also see villains at 25NL betting missed flush draws on the river all day so while I feared KT I was inclined to call anyway, thoughts? Anyone folding the river?