I think Lee Harvey Oswald only shot John F. Kennedy. He had the means and motive.
What was Oswald’s motive???
I’d go with The Interloper: Lee Harvey Oswald: http://www.amazon.com/Interloper-Harvey-Oswald-Inside-Soviet/dp/0465021816/ref=sr_1_2?s=books&ie=UTF8&qid=1409572710&sr=1-2&keywords=lee+harvey+oswald+books , LHO did it.