Is it possible to KO a running/careful top fighter with a good chin?

Can someone give me an example of a champion known to have big heart/good chin getting stopped whilst either running away or turtling up? A lot of people have said pac hasn't had KO in this many years, but a big factor of that is because everyone knows about the left hand, the power, so they either turtle up like clottey, fight more carefully than usual is rios/margarito (margarito actually blocked punches with his gloves and used the jab), run like bradley or Algeria. Only jmm fought and who has knocked him out? PAC still dropped him though. More than that, getting those KO's whilst being weight disadvantaged.

 

So far I only see heavyweights cited. And a fighter from near 100 years ago.