Spoiler Alert:  The final scene in Murder in Mississippi is of freedom marchers, their arms linked with Carol Lee Byrd's (Sheila Britt), who has, despite her ordeal, decided to remain in Mississippi to continue the voter registration drive that led to the murder of her companions.  Though the real-life murders did contribute to the momentum in passing the Civil Rights Act of 1964 and Voting Rights Act of 1965, and also inspired other young people to risk their lives fighting the suppression of African American votes, Carol Lee's character as established throughout the film would be unlikely to take such a risk.  Her conversion from a child of privilege acting out of youthful rebellion to a fearless warrior for civil rights is tough to swallow.