first i would say no, but if I had some how ended up in the past any ways I would be afraid to even sneeze. I wouldn't just go around killing people, ESPECIALLY SOME ONE WITH SUCH A BIG PART OF HISTORY. It's not like phil of the Future (disney show) where every one can just go back in time and do whatever the hell they want. When you change the past you change the future. If this were possible even the smallest thing could change history forever. There's a theory that killing/saving one single butterfly in the past could change the weather patterns of the future
Butterfly effect - Wikipedia, the free encyclopedia

Some how I think killing a human with so much influence would make things much more different.