[rikz]

At 5:1 pot odds, pretty much any hand you let yourself get this far with makes calling a no-brainer. I don't understand the $15 turn bet followed by just a call with such a short stack at that point. If you think you are good, get it all in on the turn when he raises the $15 bet. If $15 was a blocker/probe bet, then you got your answer and you should fold. Once you call the turn and get 5:1 odds, you should probably call the river with whatever you've got at that point.

So the question becomes, what would have been my minimum requirements to get myself into this situation? Answer: I'd be here, and calling, with QJs (maybe, see my comments below), 66, JJ, and QQ.

I would have reraised preflop with KK or AA in the SB. I would have folded AQ or AJ in the SB to CO's raise. I might have called with AK/JTs/KQs, but then I'd have folded those to the cutoff's raise after my weak leading turn bet. Any pocket pair that I called preflop and missed my set with I'd fold to cutoff's raise on the flop. I'd have folded preflop with anything else. Finally, even those big suited connectors are pretty weak out of position in a raised pot, especially if that pot ends up as a heads-up hand with the preflop raiser. So, I might very well have folded preflop with QJs/KQs/JTs etc. That would then leave only 66, JJ, and QQ as hands I'd be calling with by the river.