Weird little turn/river spot

Villain just sat down full-stacked a couple hands ago. Wtf is going on here? Should I have just folded to his stupid turn c/r? I called because I really don't think someone could make a play like this with no history risking value if they have a nut hand. Also, if the river doesn't complete the straight should I call his ridiculous bet? Or is that giving an unknown too much credit, and should I assume he's totally capable of playing a made hand on the flop/turn like this?


$0.50/$1 No Limit Holdem
5 players
Converted at weaktight.com

Stacks:
Hero ($118.55)
CO ($81.00)
BTN ($25.40)
SB ($113.60)
BB ($97.60)

Pre-flop: ($1.5, 5 players) Hero is UTG
Hero bets $3, 3 folds, BB calls $2.

Flop: ($6.5, 2 players)
BB checks, Hero checks

Turn: ($6.5, 2 players)
BB checks, Hero bets $4, BB bets $11, Hero calls $7.

River: ($28.5, 2 players)
BB bets $25, Hero folds

Final Pot: $53.50
Hero shows:

BB wins $52.1 ( won $13.1 )
Hero lost -$14.00

If you're calling the turn you can't fold on this river. So just fold the turn.

Originally Posted by Deanglow

If you're calling the turn you can't fold on this river. So just fold the turn.

It completed the open ended straight draw though.