Who believes that Lee harvey Oswald killed JFK?

i think it`s very possible oswald didn`t kill jfk.a lot of people were unhappy with jfk over the "bay of pigs" fiasco.oswald was convieniently murdered before he could get to trial.if you look at footage of him,he had been beaten while under arrest,but he still said to the cameras that he had not shot anyone.i find it remarkable that the most wanted man in the world ,somebody was able to walk up to him with a gun & shoot him from inches away & they were able to get it on film.there were also a lot of people very high up in the fbi that did not like jfk,who had unlimited recourses of money & manpower