There are a number of movies out there but some are not directly about the assassination mechanics themselves.
"Fatal Deception: Mrs. Lee Harvey Oswald" with Frank Whaley, he's in JFK as well as one of the LHO doubles in the conspiracy theories.
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I might have seen it, there is also I believe it is called "Love Field" about the couple that travels to DC...but it is only about the way life was in America that day.