Cary Katz Takes it on the River

It was a battle of the blinds between Cary Katz in the small blind and Fedor Holz in the big blind. On a flop of [8h][4c][3h], Katz checked and Holz bet 5,000.
Katz called and the turn was the [7h]. Katz checked again and Holz checked behind. The river was the [6d] and Katz bet 15,000. Holz folded and Katz dragged the pot.