Earlier quoted context omitted.
And the article for John Wilkes Booth describes him as an "American stage actor" even though that's not what he's known for. If you keep reading the article, however, it's almost completely about what he is known for (a statement true for both cases). That's just standard wikipedia formatting.
"Standard wikipedia formatting" being burying the lead is not a compelling defense. It's damn near misleading. I find "an American stage actor who assassinated President Abraham Lincoln" to be a ridiculous introduction; it should read "an American assassin who killed President Abraham Lincoln" -- the man's profession is completely irrelevant; he is notable for this one act. It isn't even consistently applied: Ted Kac…
Charles Guiteau had a long career prior to assassinating Garfield, as did Booth before assassinating Lincoln. While both committed assassinations, there was no point in time where you could have hired either to assassinate someone for you, it wasn't either of their professions.