[rando]

If you're willing to call the turn for that much, you should lead out for half to 2/3 the pot to gather more info (fold to action, if he calls you're in better shape). He's representing either a great LD probably with diamonds or broadway, right? Top two here is nice with 2nd NLD, so why tell him what you don't have when you can ask what he does have? As it is you've left yourself incapacitated on the river because he could have anything. His check behind implies to me that had a LD with 2 diamonds and you're the winner, but yeah even now it's hard to tell. Of course if you bet $15 and he calls you're probably still stalled on the river when a 4th high comes, but that's not the point.