In the movie "Presumed Innocent," the killer is revealed to be Carolyn Polhemus, played by Greta Scacchi. The protagonist, Rusty Sabich, portrayed by Harrison Ford, is accused of her murder but ultimately uncovers that the real murderer is his boss, Raymond Horgan, played by Brian Dennehy. Horgan killed Carolyn to protect himself and maintain his political career, as she was threatening to expose their affair and other secrets. The film is a complex legal thriller that explores themes of power, betrayal, and moral ambiguity.

In "Presumed Innocent," it is ultimately revealed that Rusty Sabich's wife, Barbara, played by Bonnie Bedelia, did indeed kill the victim, Carolyn Polhemus. Throughout the film, Rusty, a prosecutor, is accused of Carolyn's murder, but as the story unfolds, evidence and revelations point to Barbara's involvement in the crime. The film explores themes of betrayal, infidelity, and the complexities of marital relationships, culminating in the shocking twist regarding Barbara's guilt.

"Presumed Innocent" is primarily known as a 1990 film directed by Alan J. Pakula, based on Scott Turow's novel of the same name. There is also a series titled "Presumed Innocent" that premiered in 2021, which is a reimagining of the story and focuses on new characters and plotlines, distinct from the original film. While both share the same source material, they are separate adaptations with different narratives and approaches.

As of October 2023, "Presumed Innocent" is not available on Netflix. However, it can typically be found on Amazon Prime Video, either for rental or purchase. Availability may vary by region, so it's best to check your local listings on these platforms for the most accurate information.