Tricky River Decision 10/20 6-max

[ISF]

Villan was something like 38/22 or so. He had been stealing alot, and I had been threebeting him quite a bit, and up to this point he had been folding without a showdown so he could have decided to take a stand with a weak holding. Is this a check fold? After the flop call is a 10-8 or small pp more likely then an A,J or Q making it a thin value bet?
For some reason the converter doesnt seem to work with this file.
Villan raises on button I threebet 99.
Flop AA8r. I bet he calls.
Turn Q completing the rainbow. I bet he calls.
River J now what?