25nl river decision

villain is 31/0/2.2 over 133 hands and has a river AF of 6.5. Is this a call?

Ultimate Bet No-Limit Hold'em, $.25 BB (6 handed) Ultimate-Bet Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

saw flop|saw showdown

MP ($13.30)
CO ($23.50)
Button ($10.86)
Hero ($24.74)
BB ($32.97)
UTG ($21)

Preflop: Hero is SB with Thttp://www.flopturnriver.com/phpBB2/...es/diamond.gif, Thttp://www.flopturnriver.com/phpBB2/...iles/heart.gif.
UTG calls $0.25, 3 folds, Hero raises to $1.1, 1 fold, UTG calls $0.85.

Flop: ($2.45) Thttp://www.flopturnriver.com/phpBB2/...miles/club.gif, 3http://www.flopturnriver.com/phpBB2/...miles/club.gif, Jhttp://www.flopturnriver.com/phpBB2/...iles/spade.gif (2 players)
Hero bets $1.75, UTG calls $1.75.

Turn: ($5.95) Ahttp://www.flopturnriver.com/phpBB2/...iles/spade.gif (2 players)
Hero bets $4.25, UTG calls $4.25.

River: ($14.45) Qhttp://www.flopturnriver.com/phpBB2/...es/diamond.gif (2 players)
Hero checks, UTG bets $13.9 (All-In), Hero ???

fold

Me too.

EWW

i dont think i could click the fold button, even though he probably has a king.

normally i would turbomuck this, but the 6.5 river AF through me off here

Sample is too small to put much creedence on river af. If he knew how to raise pf I'd probably call since it's less likely he has a king.