had the same thing - twice this morning - the first tiime the K was on the flop - and everyone checked -and I bet the turn and river and the caller had like K7 or something -
second time K was on turn - Ihad led the flop about 3/4+ I bet 1/3 pot to see where I was - the villain just called - there was no obvious flush/str8 - he was betting aggro enough for a set - put home on TP decent kicker - bet 3/4 pot on innocuous river - bam - villain had KJ - doh!