Or he's not nearly as tight as
@Senzrock thinks he is. That river raise with KQ just seems so freaking awful. If he's telling the truth, Villain got lucky; he was bluffing and didn't realize it.
Also for the record, I don't like the lead out on the river either. I'm check-calling and giving villain a chance to bluff or value-own himself, and also protecting myself from having to fold when I bet and he raises.
I'm more likely to bet-fold here in a cash game than a tourney. In cash I want to go for the thin value more often, but in a tourney I don't mind losing it in exchange for protecting my stack. This may vary depending on how deep I am and how much I can rebuy or add-on at the time.