I'm going to go with the evil corporation thing and say that EA, Valve, Bethesda, Bioware or Rockstar put the hit on me, whoever didn't hire me themselves, because it wouldn't happen right now, because no one would have a reason to, at least not anyone who knew enough about me. Some people on this forum want to be seen as complete nutjobs and might do it by mistake after I angered one of them.
In the first scenario I'd find my own employer, and tell them to protect me. I'd also take whatever precautions I could myself.
In the second scenario, whoever managed to find a hitman to send after me would either find a very bad one, and then I'd set a trap and kick their ass, or an extremely good one, who's devoted to their mission to an insane level (because only those two would be available to get to me, anyone who lives around here would be a pretty lousy amateur (our most famous serial killer killed a single person, and tried to kill 7 more or something, but they all survived), or an extremely dedicated fuckjob willing to travel a lot). In that case I'd die, probably found in my own trap so it looked like I was being stupid. Then whoever hired it would be killed as well, because not many people here could afford a super hitman.