I hope you'll consider showing him that you are the boss before killing him. My rooster doesn't bother me -- all I had to do when he was a slightly jerky adolescent last summer was lean in and stare him down hard -- but he does bother others. He still acts like he's thinking about bothering me but he doesn't attack. My guy carried a fishing net around and scooped him up and held him down a few times -- that made him behave around my guy, for the most part.
The reason I hope you'll save him from himself, other than the obvious, is that having a rooster around is very good for free ranging hens. The rooster's aggressiveness is exactly what is needed when hawks, dogs, and other hen murderers show up!