Remember the adoring fan from oblivion what if I told you he was an elite assassin. His real name is cicero. In cicero's journals it describes a assassination in the imperial city. It talks about how he assassinated the grand champion by pretending to be the grand champions biggest fan. While in a forest he slit the grand champions throat and killed him. Did you ever wonder why he carried a dagger but never used it. It is described in ciceros's journal volume one. This a funny easter egg I thought.
Maybe but cicero and the adoring fan have the same voice actor and their both crazy. Cicero could have been blessed by longevity or he could have been a vampire. It's saying what would of happened without the storyline. And why did he have a dagger. It could just be a reference but I don't think so. And it's cicero he's also annoying.
Then your character would've had to live nearly 200 more years too, because that's when the murder takes place. And again, we know the character's fate from Oblivion (Cheese!), it's already in the lore. No matter how you slice it, it cannot be the same Grand Champion. But, yes, it was a fun easter egg.
But did you know that Nazeem and FO:3's 3dog was the same?
http://www.uesp.net/wiki/Skyrim:Cicero
http://www.uesp.net/wiki/Oblivion:Adoring_Fan
Scroll down to trivia to double checl.
Here's the Lore Group Link, in case you want to follow the lady's advice.