“Executive Action”?
Fictionalized plot for Executive Action with Burt Lancaster and Will Geer (1973). I think it’s really close to the way it may have happened. No one really knows.
And please, the important film for me JFK by Oliver Stone as cited now has a sequel dvd set of 6 hours (true) of supplementary interviews, films to analyze and deleted scenes. Came out in 2021 along with the hardcover book JFK Revisited.
JFK Revisited: Through the Looking Glass (dvd and Netflix and others)
2021 (1h 58 min version) only.