There were plenty of people who died on November 22, 1963.
The President of the United States was one of them. John F. Kennedy was assassinated by Lee Harvey Oswald. In public. In the open air. On film. Next to his wife. Brutal.
Who knows what the world would have become had he lived?
On another continent, another guy with the nickname Jack also died from complications related to kidney failure. His brother found him. No film. No public. No bullet. No wife.
The world knows what it has become since he died. Because he lives on his writings. His life and his writings have pointed people to a better place. His life and writings pointed to the importance of fidelity in marriage and joy in suffering. His life and writings pointed to the importance and influence of friendship. Narnia. Miracles. Abolitions and Great Divorces. Mere Christianity. Reflections on songbooks and meditations on four kinds of love.
And this leads me to conclude, with no disrespect to the former President of his family:
Clive Staples Lewis > John Fitzgerald Kennedy