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I'm having a hard time putting villain on a range, but I wouldn't be totally surprised to see him have a flush, or a pair like TT/JJ (especially with a heart). Also possible is a bluff - most likely with JT - but it's a little tricky to put him on many drawing hands that missed and want to turn themselves into a bluff.

Combined with the strangeness of the river check/raise I think you get looked up light and fold few better hands. There could be some tendency of live players that I don't understand that makes this better than it appears (i.e. river check/raise only means the nuts or something), but without that context I don't like it.