(NewsNation) — In the weeks since the nation marked the somber anniversary of the assassination of President John F. Kennedy, those who were present at Dealey Plaza on Nov. 22, 1963 are telling NewsNation what they saw.

People still flock to Dealey Plaza, which the presidential motorcade was passing through when Kennedy was killed.

Watch the full Unsolved: The JFK Assassination Special Report in the player above.

“The assassination certainly defined a generation,” said Stephen Fagin, curator at The Sixth Floor Museum at Dealey Plaza, which tells the story of the assassination from the Texas School Book Depository, where Lee Harvey Oswald’s sniper’s perch was found. “For those people who lived through it and came of age in the 1960s, it represented a significant shift in American culture.”

“So many of the voices that were here, even 10 years ago, to share their memories — law enforcement officials, reporters, eyewitnesses — so many of those folks have passed away,” Fagin told The Associated Press.

In 2021, the National Archives made public nearly 1,500 documents related to the U.S. government’s investigation into the 1963 assassination of President John F. Kennedy.

The disclosure of secret cables, internal memos and other documents satisfies a deadline set in October by President Joe Biden and is in keeping with a federal statute that calls for the government to release records in its possession concerning the Kennedy assassination. Additional documents are expected to be made public next year.

There was no indication that the records contained new revelations that could radically reshape the public’s understanding of the events surrounding Kennedy’s assassination.

The Associated Press contributed to this report.