I personally think you shouldn't kill anyone. Especially if it's for a really simple reason. That's just me though. Um, is that person bothering you badly or something?
NO!!! IF YOU DO THAT SECRET pagong VENOM WILL ACTIVATE IN YOUR BODY AND YOU'LL START HAVING A CRAVING FOR pizza AND BECOME PREGNANT! DIDN'T THEY TELL YOU THAT IN SCHOOL?!
If this is a serious question, you should probably re-evaluate your morals.
Or at least rethink whether or not you want to get caught and go to prison, yknow, in case the idea of murdering someone isn't enough of a turnoff for you.