I need a good thesis statement for my researchpaper I had one but the teacher said it was little long so I came up with another one and the teacher said it was too short...

Tell us the long and the short versions, so maybe we can help you find something middle of the road? It would also possibly help to know what avenue you wish to approach the subject from? For example, are you wanting to support the thesis that his death was a conspiracy? Or do you want to go with the idea that he may have known that it was going to happen? Those are only a couple of ideas, in no way suggesting that either are accurate... only trying to give ideas toward getting a clearer picture of what direction you would like to take with your project.

I really don't know what the answer would be to some of these ha! But am pretty sure it's a qonna be a qurl