Joan Collins is Evelyn Nesbit, the beautiful "Girl in the Red Velvet Swing" in this 1955 film also starring Ray Milland, Farley Granger, Cornelia Otis Skinner, Frances Fuller, and Glenda Farrell. The film purports to tell the story of the White-Nesbitt-Thaw triangle that ended with the murder of White, the arrest of Thaw, and the testimony of Nesbit.
The facts are there, but as others have pointed out, the personalities are not. White (Milland) in fact was a notorious womanizer, and Evelyn was but another conquest. And while it may surprise people that beautiful, sexy "Dynasty" star Joan Collins could play demure and innocent, Evelyn probably wasn't. The unbalanced Thaw (Granger) was also a drug addict, not mentioned in the movie.
This film, which initially was to star Marilyn Monroe and later Sheree North, should have been much more exciting, given a) the story and b) the money spent on it. Unfortunately, the lack of character development holds it up. The White character remains elusive; Milland never loosens up. Granger does an excellent job as Thaw. Collins is absolutely beautiful and does a good job with the character, but the character as written doesn't give the film much of an edge.
The scene on the swing between Evelyn and White is dizzying and dazzling; and the end of the film is one of the best things about it.
Evelyn Nesbit overcame the trial, rejection by Thaw's family, suicide attempts, alcoholism, and addiction to morphine, living until the age of 82 in 1967. She served as an adviser on this film.