I'm not aware of an instance of any of the cited historical figures responding to slanderous lies by simply killing the perp.
[Wrong thread, by the way.]
Andrew Jackson killed a man named Charles Dickinson, although there appears to be some debate as to whether it was over an insult to his wife [in regard to some irregularities concerning her divorce from her first husband]
http://www.historychannel.com/tdih/tdih.jsp?category=general&month=10272957&day=10272995or whether it was because Dickinson had called Jackson a "worthless scoundrel ... a poltroon and a coward."
http://odur.let.rug.nl/~usa/P/aj7/about/bio/duel.htmIt looks like you were right in that the killing took place within the confines of a duel [I had always had it in the back of my mind that Jackson just let loose on the guy], although The History Channel link above hints that Jackson was rumored to have fought a number of these duels during his life [in regards to the question of his wife's honor - and yes, I am curious as to why her first husband divorced her].
Anyway, it would be interesting if one of the sons in the Killian family were to challenge Moonves to a duel.
But again, for the record, if I were the aggrieved party, I don't think I'd go to the bother of challenging Moonves to a dual - I think I'd just kill the son of a bitch.