The I, Tonya Oscar nominee Margot Robbie plays Sharon Tate, the Valley of the Dolls actress who was murdered by Charles Manson?s ?Family? in Quentin Tarantino's 'Once Upon A Time In Hollywood.' Based on the first-look image that Robbie posted to Instagram on Monday, Tarantino made the right choice in giving the role to Robbie. Once Upon a Time in Hollywood is scheduled for a July 26, 2019 release.