Nobody in 57 years can or has proven with hard, credible, undisputed evidence that Oswald killed Kennedy.
And around we go.
If Oswald acted alone, given the maze of the TSBD, the general unreliability of eyewitnesses, the rough stock on the Carcano, the fact that Fritz didn't tape record the interrogation sessions, the fact that it was lunchtime during a presidential motorcade and most of the TSBD employees were outside the building, etc, etc, etc, etc. etc, etc, ..... well, what kind of "hard, credible, undisputed evidence" would you expect to find?
LOL!
-- MWT