Dallas held its first official ceremony to commemorate the assassination of President John F. Kennedy after 50 years.
She's one of the last people still alive who knew Lee Harvey Oswald personally. CNN's Brian Todd searches for Marina Oswald Porter - the widow of JFK's assassin - to see if she has any insights into who her husband was or what happened on that day nearly 50 years ago.
A horse famed for horsing around at JFK's funeral ... CNN's Jeanne Moos talks to the man who walked the riderless horse.
Brian Todd reports on fascinating, newly-released audiotapes from moments after JFK assassination.
CNN's Mary Snow takes a look at what historians are calling a gold mine of secretly recorded JFK tapes.
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