The story of Rosemary Kennedy has long been relegated to the footnotes of American political history, a tragic secret buried beneath the mythos of the Kennedy dynasty. Now, that narrative is shifting. Sasha Pieterse, best known for her role in Pretty Little Liars, has been tapped to star as the eldest Kennedy daughter in Rosemary, a psychological thriller that aims to center the film on her perspective rather than the political ambitions of her father.

This is not a traditional biopic. The project, which is being shepherded by veteran producer Mike Medavoy—whose credits include Black Swan and Shutter Island—is framed as a contained thriller. It focuses on the period leading up to the 1941 lobotomy that left the 23-year-old permanently incapacitated, effectively erasing her from public life for the next six decades.

For the production team, the goal is to reclaim a narrative that has been defined by clinical reports and political damage control. "This film takes a story that has long lived in the shadows of history and places Rosemary at the center," Medavoy said in a statement. "Not as a footnote in a political dynasty, but as a young woman with hopes, fears, and a voice that was never truly heard."

A Shift in Perspective

The script, written and directed by Cory Todd Hughes and Adrian Speckert, draws from the reporting of All That’s Interesting. By choosing the psychological thriller format, the filmmakers intend to dramatize the claustrophobia of Rosemary’s life as she navigated developmental delays and behavioral issues under the intense scrutiny of Joseph P. Kennedy Sr.

Pieterse, who recently launched her own production banner, Mother Bare Productions, sees the role as a departure from her previous work. "Rosemary’s story has been told in fragments," Pieterse said. "What drew me to this project is how it explores her as a person, not a symbol, but a fully realized human being with dreams and vulnerabilities."

The Business Behind the Lens

Beyond the creative team, the project is a significant play for Motus Studios, which is handling international sales. The production is a reunion of sorts; Pieterse recently starred in The Image Of You, a film that involved several of the same key players, including associate producer Nick Medavoy and executive producer Kaan Karahan.

While the film is currently in development, the involvement of Mike Medavoy signals a serious attempt to bring a high-production-value aesthetic to what is essentially a character study. The film’s success will likely hinge on whether it can balance the historical weight of the Kennedy name with the intimate, often harrowing, nature of Rosemary’s personal experience.

Key Takeaways

  • A New Lens: The film is being marketed as a psychological thriller that centers on Rosemary Kennedy’s internal experience rather than the broader political context of her family.
  • Industry Backing: Veteran producer Mike Medavoy is attached to the project, providing significant industry weight to the indie production.
  • Creative Team: The film is written and directed by Cory Todd Hughes and Adrian Speckert, who are also collaborating with Pieterse on the upcoming Infernal Affairs series.

The Path Forward

With the project now in active development, the next hurdle for the production team is the casting of the supporting roles, particularly the portrayal of Joseph P. Kennedy Sr., whose decision to authorize the lobotomy remains the central, defining conflict of the film. The team is expected to move into pre-production later this year, with a target for principal photography to begin in early 2025. For Pieterse, the performance will serve as a definitive test of her range outside of the teen drama genre that defined her early career.