50NL - AK vs. weird villain line

[canavarr]

villain is 42/0/3.6 (40 hands) apparently donkish by looking at his stats. What would you put him on with his weird min bet call, min bet call, bet big line?? please comment on my play on the other streets too..

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
6 players
Converter

Stack sizes:
UTG: $51.55
UTG+1: $53.35
Hero: $53
Button: $89.60
SB: $10
BB: $48.90

Pre-flop: (6 players) Hero is CO with K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img]
UTG calls, UTG+1 folds, <font color="#cc0000">Hero raises to $2.5</font>, 2 folds, UTG calls.

Flop: 8[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/spade.gif[/img] ($5.75, 3 players)
<font color="#cc0000">UTG bets $0.5</font>, <font color="#cc0000">Hero raises to $5</font>, UTG calls.

Turn: T[img]/images/graemlins/spade.gif[/img] ($15.75, 3 players)
<font color="#cc0000">UTG bets $0.5</font>, <font color="#cc0000">Hero raises to $7.5</font>, UTG calls.

River: 5[img]/images/graemlins/spade.gif[/img] ($30.75, 3 players)
<font color="#cc0000">UTG bets $23.5</font>, Hero ???

[sightless]

flush draw? eh i call river

[canavarr]

i would also include a str8 draw (QJ, 67) and even aces up (A8, A7, AT,A5) in his range. some donks play big hands like this. what else do you guys think, are we ahead his range for a call here?!

[Subzero_Wins]

I would ignore his lead and raise the turn more. Doing this mainly for spite/value, but it makes your hand easier to play to boot.

As played I fold river, looks a lot to me like two pair and makes no sense as a bluff line.

[mookboi]

Raise more on turn.
Call river as played.