There is no reliable evidence that Johnson had anything to do was Kennedy's assassination. The assassination has been investigated and studied extensively but nothing more conclusive than the Warren report has come out. Many questions still remain and people are still trying to find definitive answers.
The Warren Commission.
November 22, 1963
Chief Justice Earl Warren.
John F. Kennedy was NEVER a Vice-President.
Jackie
There was a commission formed made up of senators and others. One of the members was Gerald Ford who would later become president after Nixon resigned from office. A report was produced and it can still be found if you want to read it.
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Senator
Lancer
January 20 1961
In the end -Commander in Chief (as president).
Black Jack