I understand that most duels were fought with the intention that preferably nobody should die, but clearly this commonly did not happen, as Alexander Hamilton found out. A lot of notable figures fought duels and killed people, such as Daniel O'Connell, but it didn't seem to have catastrophic effects on their personal or professional lives. What could I expect if were to kill someone in a duel? Would I be perceived as a murderer, at least by the victims family? Would I come under immense scrutiny over how well I conducted the duel, or my reasons for doing so? Would my character and behavior outside of the duel play into people's sense of whether or not I was a scoundrel because of it? Would it be something that would be held against me in the public sphere at all?
I've written a good deal on this in the past, but I this you might find this chain and the defense of Capt. Macnamara to be of particular interest, although several of the answers there are relevant. Of course happy to answer any follow-up questions you might have.