very deep stars 10/20

[Dr. Strangelove]

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he isnt representing an overpair, he has 2p+, air, or a monster draw. If he has an overpair this riase is a bluff of sorts(i.e. he isnt value betting the river).

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I know he's representing a hand stronger than an overpair, but I could see an overpair checkraising here after coming to the conclusion that he is ahead of your hand range, thinking you will fold a lot of hands with outs that will only put money in on the river if they improve, including some draws that would be difficult to play against on the river.

Putting the commitment decision on you while planning to not put another penny in the pot if reraised.