[Poker monkey]

I'm not a high stakes player by any means, but I've watched sbrugby play quite a bit. I doubt very much that he's overbetting without a big hand here. 3 nines a the least, more likely a boat. He's not calling from the blind with a worse King, he probably checks the river with a marginal hand. You're obviously only beating a bluff, and you've repped a big hand so I don't think sbrugby is going to throw $30,000 away without a stronger one. (i.e. fold river.)