Back in August 1969, Tate and five of her friends were murdered at her Hollywood home cult leader Charles Manson’s followers, while her filmmaker husband Roman Polanski was out of town. The 26-year-old actress, who was pregnant at the time, was due to give birth in two weeks—and her unborn son also died.
Duff previously hinted that she was working on a project, but this marked the first time that she revealed specifics about it. Over the weekend, she shared another snap that showed her rocking a polka dot red and white dress near a police car as she jokingly palmed a swaddled teddy bear. “Had the baby,” she wrote alongside it, after teasing fans with a shot of herself sporting a faux baby bump.
The film will reportedly take a look at the last days leading up to Tate’s murder from her point of view.
This article originally appeared on InStyle U.S.