He impersonated Superman. And then he up and died!
He was a good Superman compared to the one they have now. Those Smallville stories are so wussy. They don't show the honor, power and valour of Clark Kent a.k.a. Superman, they disintegrate each story line by showing how Superman can be made powerless, by others, by sex, or by many many variations of kriptonite. Too bad. America needs heroes.