Villian is semi-loose, I've seen him make some bad calldowns.

Party Poker No-Limit Hold'em, $ BB (9 handed) from (Format: FlopTurnRiver)

saw flop|saw showdown

MP3 ($54.25)
CO ($28.15)
Button ($55.67)
SB ($16)
BB ($24.80)
Hero ($56)
UTG+1 ($121.09)
MP1 ($24.30)
MP2 ($48)

Preflop: Hero is UTG with A, A. SB posts a blind of $0.25.
Hero raises to $2, UTG+1 calls $2, 6 folds, BB calls $1.50.

Flop: ($6.25) K, 6, 5 (3 players)
BB checks, Hero bets $5, UTG+1 calls $5, BB calls $5.

Turn: ($21.25) 8 (3 players)
BB checks, Hero bets $15, UTG+1 raises to $30, BB folds, Hero calls $34 (All-In), UTG+1 calls $19.

River: ($119.25) Q (2 players, 1 all-in)

Final Pot: $119.25

Does anyone think anything of his "subtle" raise on the turn? Or are we going broke here given the size of the pot?

Wow, tough spot, as you're getting a little more than 2:1 on your money.

The fact that there were 3 to the flop and your opponent still slowplayed (or somehow turned a set or straight) makes me less inclined to believe he has only top pair. Especially since you claim he's a "loose caller" and you saw him call down before, but now he decides to min-raisee with another player behind him.

I probably have to fold here but hate doing it. I just don't see him flipping over AK or QK enough to make your push profitable.