Americans across the country paused today to mark the 50th anniversary of President John F. Kennedy's assassination.

Kennedy was fatally shot in Dallas on Nov. 22, 1963. A moment of silence was held in the city to mark the moment the president was shot. A new monument was also unveiled on the now infamous grassy knoll.

A somber ceremony was also held at Arlington National Cemetery. Kennedy's last surviving sibling, Jean, helped lay a wreath at her brother's gravesite.

A wreath was also placed at a memorial to honor of Dallas Police Officer J.D. Tippit, who was also shot and killed by Lee Harvey Oswald.