It didn't, it just made him dead. In order to be a martyr Kennedy would have had to die for a cause. We still don't know why he was killed. There are so many theories but not a single one has been proven beyond a shadow of doubt.
The Warren Commission.
November 22, 1963
Chief Justice Earl Warren.
Lincoln's assassination turned him into a martyr because he had accomplished a lot to better this nation and because he was loved by millions of people, even many Southerners. The man who killed him did it for political and personal reasons. People really loathed him for killing Abraham Lincoln. He was finally captured and punished.
His memory was elevated to near sainthoood and at the same time he was elevated to a positon as a martyr in Communist society.
You could say. 'Don't treat me like a martyr'
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
January 20 1961
Lancer