Today marks the 50th anniversary of the assassination of President John F. Kennedy.

Three days after he was assassinated by Lee Harvey Oswald, Kennedy was laid to rest at Arlington National Cemetery after a mass at the Cathedral of St. Matthew. The Cathedral will hold a mass of remembrance today at 5:30 p.m.

The Cathedral will mark the anniversary of the day of President Kennedy’s death with a Eucharistic celebration including choral music. A musical prelude will begin at 5:10 p.m.

JFK’s funeral card. (White House Staff Files of Sanford Fox/Via JFK Presidential Library.)

Above is a gallery of the funeral procession through Washington, D.C. Below are a few of the 1.5 million condolence letters sent to First Lady Jacqueline Kennedy, via the John. F Kennedy Presidential Library.

Jackie Kennedy’s response. (White House Staff Files of Sanford Fox/Via JFK Presidential Library.)

Jazz great Duke Ellington: “Not as much as you and your family, but we and many who believed in his rightness today suffer the great loss of your great man.”

Nikita Khrushchev, Premier of the Soviet Union: “It was with deep personal grief that I learned about the tragic death of your husband, President of the U.S. John F. Kennedy. All people who knew him greatly respected him, and I shall always keep the memory of my meetings with him. Accept my most sincere condolences and expressions of wholehearted sympathy with your grievous bereavement.”

Poet Ezra Pound: “Great grief to all men of good will. Heartfelt condolences. Great man and president.”

Actor Cary Grant: “No one can fully share the depth of your sorrow or convey the degree of their sympathy. But the prayers and thoughts of each of us reach out to you and your children.”

General Douglas MacArthur: “I realize the utter futility of words at such a time, but the world of civilization shares the poignancy of this monumental tragedy. As a former comrade in arms, hit death kills something within me.”

Civil Rights leader Martin Luther King, Jr.: “May God give you and your family the strength and courage you need in this hour of bereavement. We pray that you may take courage in the fact that you knew a great man so intimately. A man who, though young in years and who served his country as president for such a short while, has left magnificent imprint on the pages of history. His dedication to peace and justice, and his energetic effort to achieve these ends, places him beside the greatest. Our country and the world will long remember him.”